Fix check of Ant exit code.
Fix scripts to support SDK Tools Revision 21.1.

Main changes :

  * Replace file that contains copied codes from SDK clearly.

  * Copy and modify test target from SDK Tools Revision 21.1.

  * Change outputted directory of coverage report to
    the one of current SDK.
Fix documents to support SDK Tools Revision 21.1.
Merge branch 'feature-support-sdk-r21.1'