docs: moar analytics for all md files

CHANGELOG.md

@@ -4384,3 +4384,6 @@ with the `$route` service
 [module]: http://docs-next.angularjs.org/api/angular.mock.module
 [guide2.di]: http://docs-next.angularjs.org/guide/dev_guide.di
 [jqLite2]: http://docs.angularjs.org/#!/api/angular.element
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+[![Analytics](https://ga-beacon.appspot.com/UA-8594346-11/angular.js/CHANGELOG.md?pixel)](https://github.com/igrigorik/ga-beacon)

CONTRIBUTING.md

@@ -258,3 +258,6 @@ You can find out more detailed information about contributing in the
 [corporate-cla]: http://code.google.com/legal/corporate-cla-v1.0.html
 [commit-message-format]: https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit#
 [github-pr-helper]: https://chrome.google.com/webstore/detail/github-pr-helper/mokbklfnaddkkbolfldepnkfmanfhpen
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+[![Analytics](https://ga-beacon.appspot.com/UA-8594346-11/angular.js/CONTRIBUTING.md?pixel)](https://github.com/igrigorik/ga-beacon)

README.md

@@ -39,5 +39,6 @@ To execute end-to-end (e2e) tests, use:
 To learn more about the grunt tasks, run `grunt --help` and also read our
 [contribution guidelines](http://docs.angularjs.org/misc/contribute).
 
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 [![Analytics](https://ga-beacon.appspot.com/UA-8594346-11/angular.js/README.md?pixel)](https://github.com/igrigorik/ga-beacon)
 

TRIAGING.md

@@ -59,3 +59,5 @@ The following is done automatically and should not be done manually:
 
 1. Unassign yourself from the issue
 
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+[![Analytics](https://ga-beacon.appspot.com/UA-8594346-11/angular.js/TRIAGING.md?pixel)](https://github.com/igrigorik/ga-beacon)