Merge pull request #96 from wang16/xwalk

Fix that onNewIntent in CordovaWebView should return boolean as in XWalk...
Refactor the usage after the changes of extension mechanism in core library.

Crosswalk core library is changed and the extension mechanism/implementation
now is inside of core library. No need to call extension manager anymore.

Besides, onPause/onResume/onDestroy functions are called in CordovaWebView.
It's because we don't only pause/resume timers but also need to pause/resume
video playback, popup dialog and others. All of these are handled in above
functions.
Merge pull request #97 from yongsheng/embedding

Refactor the usage after the changes of extension mechanism in core libr...
Remove copy asset step from create script

It's not needed anymore, assets from xwalk_core_library
have been moved to res/raw.