override more Activity's methods to avoid using 'that' pointer mostly,then,support plugin apk runs alone when installed.
support FragmentActivity
support FragmentActivity:upload DLBasePluginFragmentActivity,etc.
change parameter of DLClassloader,avoid context leak
exact classloader to DLClassLoader,prevent memory leak.

Change-Id: I498acabde81d91cd1921c24cb5e266e567f1e135
Merge pull request #8 from singwhatiwanna/dev

merge branch "dev" into master.