Add emulator detection hack to allow running OpenGL ES 2.0 projects in the emulator
android:Add emulator detection and config change to allow running OpenGL ES 2.0 projects in the emulator

Code taken from forum post by Romain TISSERAND
http://www.cocos2d-x.org/boards/6/topics/12563?r=25446#message-25446
Add plugin code into cocos2d-x engine.
Submit the sample code HelloIIAP.
Commit the tools for game developers.
Remove the environment config for plugin.
Merge pull request #2319 from natural-law/master

fixed #1471: Plugin system design.
Merge pull request #2318 from Yodesoft/master

Reduce function call in nativeInitBitmapDC to improve performance.
Update AUTHORS
Merge pull request #2288 from mchinen/master

Android: fix emulator for OpenGL ES 2.0
Update AUTHORS