Begin Copy Sound per ActionBar
Fix issue#498

Added Catrobat-Link to about dialog like in Pocketpaint
Merge pull request #522 from Catrobat/issue#498

Fix issue#498
Fix issue#485

Inserted notification dialog for community button.
Merge branch 'master' into issue#485
implemented copy sound per action bar
Merge branch 'master' into gsoc_copySoundActionBar
added test regarding to copy Sound per ActionBar
fixed Bugs
fix test
Merge pull request #524 from Catrobat/gsoc_copySoundActionBar

Gsoc copy sound action bar
testruns: 
UI package: http://jenkins.catrob.at/job/Catroid-single-UI-package-test/152/console
failing test: http://jenkins.catrob.at/job/Catroid-single-UI-test/969/console
refactored BroadcastBricksTest with @robertpainsi
Merge pull request #525 from Catrobat/FixBroadcastUiTest

Just refactored variable names
Remove ProjectManager.getInstance() method
Merge pull request #526 from Catrobat/removeProjectManagerGetInstanceMethod

Removed ProjectManager.getInstance() method
Refactor singletons
Merge pull request #527 from Catrobat/refactorSingeltons

Refactor all Singletons
Merge branch 'master' into issue#485
Detect wrong assert messages with empty string or with delta value
Merge pull request #503 from Catrobat/FixAssertionErrorMessageTest

Detect wrong assert messages with empty string or with delta value.