* Improved logic for searching plist file path for iOS postlink.js
Added Xcode package for parsing xcodeproj file and retrieving correct plist file related to the project. This should also fix issue described here: https://github.com/Microsoft/react-native-code-push/issues/661
* Improved logic for searching plist file path for iOS postlink.js
Added logic to narrow xcode 'getBuildProperty' function results to specified Product_Name property. This should help us to chsose correct project from pbxproj file when we have several projects defined.
* Added logic to try to get 'Release' build of ProductName matching the package name first and if it doesn't exist then try to get any other if existing
Instead of `#import "CodePush.h"`, use `#import "<CodePush/CodePush.h>` and export CodePush.h from our module.
* [iOS][Build] Add `Headers` and `Copy Files` build phases
Due to changes in new release of `react-native@0.40.0`
there is `CodePush.h file not found` error occures.
To fix it I've added `CodePush.h` header file in `Headers`
and `Copy Files` build phases and changed
`codePushHeaderImportStatement` variable value from `#import "CodePush.h"`
to `#import <CodePush/CodePush.h>` in `postlink.js` file.
Fix https://github.com/Microsoft/react-native-code-push/issues/662
* readme: update iOS manual plugin installation/usage documentation
Due to changes in React Native v0.40.0 and changes in CodePush project Step 6. of iOS manual plugin installation (add “Header Search Paths”) is not needed anymore. Also changed path to `CodePush.h` file in `AppDelegate.m` to `#import <CodePush/CodePush.h>`
In issue #477 there was an issue when the project has, for some reason, multiple AppDelegate.m files (eg project sample files) within the ios subdir of an RN project.
This fix will give priority to the AppDelegate.m found inside any path that has the application name (as defined in package.json) in it. If it cannot find that, it will revert to previous behavior (the first element in the path array).
