quick fix for #614 (no webview on old devices)

 * fixes #614 by invoking the browser intent on old devices again
 * also the alert dialog warning will be shown
 * new option to disable this dialog
fixes Brick looking different on some devices

fixes #295 by lifting the 9.png left-bottom-border pixel up.

Devices which will be (at least) fixed are:
 * Nexus S (4.1.2)
 * Nexus 7 (4.2.2 - 2012 Edition)
Merge pull request #621 from Catrobat/issue#614

quick fix for #614 (no webview on old devices)
Merge pull request #622 from Catrobat/fixed9png

fixes Brick looking different on some devices
Copying Sprites didn't copy the local variables

 * this fix will copy the local variables in the Sprite.clone() method
 * tested in new SpriteTest.testSpriteCloneWithLocalVariable() method
Merge pull request #625 from Catrobat/fixCopySpriteVariable

Copying Sprites didn't copy the local variables
Fix issue#506
Wrote tests for SpeakStage and OnUtteranceCompletedListenerContainer
SpeakBrick generates a soundfile that is played back now
Merge pull request #627 from Catrobat/issue#506

Fix issue#506
WebView improvements
Actionbar is hidden;
History implemented (by pressing Back button);
Return to PocketCode by pressing PocketCode logo in WebView
Merge pull request #629 from Catrobat/webview

WebView improvements
Merge remote-tracking branch 'origin/master' into VirtualGamepad