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...
Enable remote debugging for debug build.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1039
Remove copy asset step from create script

It's not needed anymore, assets from xwalk_core_library
have been moved to res/raw.
Merge pull request #99 from wang16/xwalk

Remove copy asset step from create script
Merge pull request #98 from huningxin/debug_build

Enable remote debugging for debug build.
Fix the build error due to the rename of package name.

XWalkDefaultWebChromeClient is moved from org.xwalk.core.client to
org.xwalk.core. Change the package name in Cordova as well.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1227
Merge pull request #100 from yongsheng/embeddingapi

Fix the build error due to the rename of package name.
Fix the compile error caused by the change of onReceivedSslError.

The parameters of XWalkClient.onReceivedSslError are changed due to
a new fix. Change it as well here to pass the compilation.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1287