Added a post about dropdown issues in Angular.JS

Under forms, added the article:

Common Problems (And Solutions) When Using Select Elements With Angular.JS

http://gurustop.net/blog/2014/01/28/common-problems-and-solutions-when-using-select-elements-with-angular-js-ng-options-initial-selection/
Update README.md

Added: 
* [5 AngularJS Antipatterns & Pitfalls] (http://nathanleclaire.com/blog/2014/04/19/5-angularjs-antipatterns-and-pitfalls/)
* [Animating AngularJS Apps: ngView] (http://scotch.io/tutorials/javascript/animating-angularjs-apps-ngview)
* [Improving ng-repeat Performance with “track by”] (http://www.codelord.net/2014/04/15/improving-ng-repeat-performance-with-track-by/)
Translated the texts for links to Simplified Chinese
udpate chinese readme.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Merge pull request #133 from appleboy/patch

udpate chinese readme.
Added Angular with CakePHP tutorial
Added Part 1 from Trifork on Directives

Presumably there'll be more parts, so even though only 1 is available now, I put it under multi-part articles.
Merge pull request #135 from tedyoung/patch-3

Added Part 1 from Trifork on Directives
Merge pull request #129 from Meligy/patch-1

Added a post about dropdown issues in Angular.JS
Merge pull request #132 from newjs/zhdoc

Translated the texts for links to Simplified Chinese
Merge pull request #134 from kevinsearle/master

Added Angular with CakePHP tutorial
Update README.md

Added:
* [Getting Started With Protractor And Page Objects For AngularJS E2E Testing] (http://gaslight.co/blog/getting-started-with-protractor-and-page-objects-for-angularjs-e2e-testing)
* [Canceling $http Requests in AngularJS] (http://odetocode.com/blogs/scott/archive/2014/04/24/canceling-http-requests-in-angularjs.aspx)
Update README.md

Added: 
* [AngularJS: Factory vs Service vs Provider] (http://tylermcginnis.com/angularjs-factory-vs-service-vs-provider/)
Remove duplicated..

Remove duplicated content on "Lessons Learned" section
Merge pull request #136 from weblancaster/patch-1

Remove duplicated..
Update README.md

Added: 
* [The state of angularjs controllers] (http://jonathancreamer.com/the-state-of-angularjs-controllers/)
Update README.md

Added: 
* [How to use ngMessages in AngularJS] (http://www.yearofmoo.com/2014/05/how-to-use-ngmessages-in-angularjs.html)
Update README.md
Merge pull request #139 from pyprism/patch-1

Update README.md
Update README.md

manually added new link from @xwlee