Initial repository spring clean (#415)

* Move SwipeCellKit & SlackTextViewController to Local Pods directory

* Move playgrounds to own folder

* Create podspec for MMMarkdown and move to Local Pods

Local Pods/SlackTextViewController/.github/CODE_OF_CONDUCT.md

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+# Slack open source code of conduct
+
+
+## Introduction
+Diversity and inclusion make our community strong. We encourage participation from the most varied and diverse backgrounds possible and want to be very clear about where we stand.
+
+Our goal is to maintain a safe, helpful and friendly community for everyone, regardless of experience, gender identity and expression, sexual orientation, disability, personal appearance, body size, race, ethnicity, age, religion, nationality, or other defining characteristic.
+
+This code and related procedures also apply to unacceptable behavior occurring outside the scope of community activities, in all community venues (online and in-person) as well as in all one-on-one communications, and anywhere such behavior has the potential to adversely affect the safety and well-being of community members.
+
+## Expected Behavior
+  * Be welcoming.
+  * Be kind.
+  * Look out for each other.
+
+## Unacceptable Behavior
+  * Conduct or speech which might be considered sexist, racist, homophobic, transphobic, ableist or otherwise discriminatory or offensive in nature.
+  * Unwelcome, suggestive, derogatory or inappropriate nicknames or terms.
+  * Disrespect towards others. (Jokes, innuendo, dismissive attitudes.)
+  * Intimidation or harassment (online or in-person). Please read the [Citizen Code of Conduct](http://citizencodeofconduct.org/) for how we interpret harassment. 
+  * Disrespect towards differences of opinion.
+  * Inappropriate attention or contact. Be aware of how your actions affect others. If it makes someone uncomfortable, stop.
+  * Not understanding the differences between constructive criticism and disparagement.
+  * Sustained disruptions.
+  * Violence, threats of violence or violent language.
+
+## Enforcement 
+Understand that speech and actions have consequences, and unacceptable behavior will not be tolerated.
+
+If you are the subject of, or witness to any violations of this Code of Conduct, please contact us by submitting a form [here](https://docs.google.com/a/slack-corp.com/forms/d/1NVqj2S2Q49XVIOT5N3L6Tx1oihvk9CpMa_UX8T_6ESo/viewform), or email conduct@slack.com.
+
+If violations occur, organizers will take any action they deem appropriate for the infraction, up to and including expulsion.
+
+_Thanks to the [Django Code of Conduct](https://www.djangoproject.com/conduct/), [The Citizen Code of Conduct](http://citizencodeofconduct.org/), [The Rust Code of Conduct](https://www.rust-lang.org/conduct.html) and [The Ada Initiative](http://adainitiative.org/2014/02/18/howto-design-a-code-of-conduct-for-your-community/)._

Local Pods/SlackTextViewController/.github/CONTRIBUTING.md

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+# Contributing at Slack
+
+![Header Image](contributing_header_slack.png)
+
+## Before Contributing
+
+Before contributing, please read our [Code of Conduct](CODE_OF_CONDUCT.md). We take it very seriously, and expect that you will as well.
+
+## New Issues
+
+Before opening a new issue, please consider:
+
+  - Reading [the documentation](https://github.com/slackhq/SlackTextViewController/blob/master/README.md) and [the changelog](https://github.com/slackhq/SlackTextViewController/blob/master/CHANGELOG.md) first.
+  - Searching for any related issues and avoid creating duplicated issues.
+  - Adding details, diagnoses, screenshots or any type of useful information in existing issues, even if they are marked as closed. The team will still review it.
+  - Trying out the examples [provided in this repository](https://github.com/slackhq/SlackTextViewController/tree/master/Examples).
+  - Taking the time to think of a solution and [**open a pull request**](#new-pull-requests) for either improving the documentation, fixing a bug or suggesting a feature.
+  - Finally, [**open an issue**](https://github.com/slackhq/SlackTextViewController/issues/new) to report a bug, ask for help or suggest a feature. The more information you give, the better people can help you.
+
+
+## New Pull Requests
+
+We love pull requests and we are generally very receptive to contributions. Things to keep in mind:
+
+- [Fork the repository](https://github.com/slackhq/SlackTextViewController) and make sure to work on a branch up to date with origin master.
+- Do your thing!
+- Be mindful about doing atomic commits, adding documentation to your changes, not refactoring too much.
+- Add tests covering the new code or functionality you are adding.
+- Add a descriptive title and add any useful information for the reviewer. If your contribution is a user facing thing, please attach a screenshot and/or screencast (gif preferably).
+- Read and agree to our [Contributor License Agreement (CLA)](https://docs.google.com/a/slack-corp.com/forms/d/1q_w8rlJG_x_xJOoSUMNl7R35rkpA7N6pUkKhfHHMD9c/viewform). _We cannot accept your PR without your agreement to our CLA_.
+- Create your pull request (yay!). If it is in relation to an existing issue, please mention it on the title or description.
+
+[Interested in knowing more about about pull requests at Slack?](https://slack.engineering/on-empathy-pull-requests-979e4257d158#.awxtvmb2z)

Local Pods/SlackTextViewController/.github/ISSUE_TEMPLATE.md

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+* [ ] I've read and understood the [Contributing guidelines](https://github.com/slackhq/SlackTextViewController/blob/master/.github/CONTRIBUTING.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](https://github.com/slackhq/SlackTextViewController/blob/master/.github/CODE_OF_CONDUCT.md).
+* [ ] I've searched for any related issues and avoided creating a duplicate issue.
+
+#### Description
+> e.g. Description of the bug or feature
+
+#### Reproducible in:
+* [ ] This is reproducible in the sample project.
+SlackTextViewController version:
+iOS version(s):
+Device(s):
+
+#### Steps to reproduce:
+
+1. 
+2. 
+3. 
+
+### Expected result:
+> e.g. What you expected to happen
+
+### Actual result:
+> e.g. What actually happened
+
+### Attachments:
+> e.g. Logs, screenshots, screencast, sample project, funny gif, etc.
+
+

Local Pods/SlackTextViewController/.github/PULL_REQUEST_TEMPLATE.md

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+* [ ] I've read and understood the [Contributing guidelines](https://github.com/slackhq/SlackTextViewController/blob/master/.github/CONTRIBUTING.md) and have done my best effort to follow them.
+* [ ] I've read and agree to the [Code of Conduct](https://github.com/slackhq/SlackTextViewController/blob/master/.github/CODE_OF_CONDUCT.md).
+* [ ] I've been mindful about doing atomic commits, adding documentation to my changes, not refactoring too much.
+* [ ] I've a descriptive title and added any useful information for the reviewer. Where appropriate, I've attached a screenshot and/or screencast (gif preferrably).
+* [ ] I've written tests to cover the new code and functionality included in this PR.
+* [ ] I've read, agree to, and signed the [Contributor License Agreement (CLA)](https://docs.google.com/a/slack-corp.com/forms/d/1q_w8rlJG_x_xJOoSUMNl7R35rkpA7N6pUkKhfHHMD9c/viewform).
+
+#### PR Summary
+> e.g. New functionality for producing whatsits.
+
+#### Related Issues
+> e.g. Fixes #206 and closes #230
+
+#### Test strategy
+> e.g. Add tests around whatsit production.