timob-12939: Support activity recoved from force-quitting.
Don't release window/tabgroup and activity support helper or dispose the runtime if the activity is forced to destroy by Android OS.
timob-12939: update doc
timob-12939: address comment
Merge pull request #4476 from pingwang2011/timob-12939-3_1_X

Timob 12939 3 1 x: Android: Developer option "do not keep activities" cause Titanium apps to close