[Android] Add orientation support in the packaging tool.

Support the developer to set the display of app on device through
the option of packing tool. Such as: --orientation=landscape.
The default value is "unspecified".
The value options are the same as those on the Android:
http://developer.android.com/guide/topics/manifest/activity-element.html#screen
Merge pull request #1120 from junmin-zhu/orientation

[Android] Add orientation support in the packaging tool.