Changes

GLContext: Remove integer-key based attach/detach object - use String based (minor API change)

The integer based attachement is currently not used
and since it has no benefit over the String based hash map - remove it.

Fix Android/NEWT WindowDriver: Add missing eglDestroySurface() in closeNativeImpl(); Complete visibleChanged() in reconfigureWindowImpl() even if resize or reposition can't be handled

Add missing eglDestroySurface() in closeNativeImpl()
  - missing egl surface destruction leaked it's resource ..

Complete visibleChanged() in reconfigureWindowImpl() even if resize or reposition can't be handled
  - properly detect resize and reposition request, warn if this action cannot be completed
    but contine w/ workflow -> visibleChanged()

  - this allows properly handling of setVisible(..) and it's visible-changed detection polling

Fix Android Power-suspend and Power-resume

NewtBaseActivity onPause()/onResume(): add setVisible(..) allowing recreation and avoid usage of unavail resources
  - crucial for power suspend/resume, which itself calls activity onPause()/onResume(),
    this ensures resources are not used onPause().

  - Animator suspend is not sufficient due to surfaceRedrawNeeded(..) hook etc ..

  - iff power suspend leads to surfaceDestroyed(..), recreation is now possible due to setVisible(true) on onResume()
    even though I have not observed this on Android 2.3 and 4.0.1

Tested on Android 2.3 and Android 4.0.1

Android: Bump version.code: 914011