timob-17222: support the "theme" property
timob-17222: fixed doc
timob-17222: fixed title bar issues on 2.3 devices.
1. need to set "windowActionBar" to false to hide the title bar.
2. need to set the theme before super.onCreate().
3. need to set the title after setContentView.
Merge pull request #5862 from pingwang2011/timob-17222

Timob 17222: Android: support the theme property for windows