Merge pull request #10 from natural-law/develop

Update the JS binding code & samples for latest cocos2d engine.
JAVAVM is null will crash...
Merge pull request #11 from liang8305/javavm_null_point

JAVAVM is null will crash and is hard to debug
Android IAP added to plugin-x and AUTHORS
Merge pull request #12 from martell/androidiap

Android IAP added to plugin-x and AUTHORS