Formula Editor Item
added item to the click-event of the bricks which have an formula edit
field
JUnit-Test added
for the menu item edit formula
checked test, which failed on jenkins
Function getFormula() is now part of the interface FormulaBrick
deleted comments
Merge branch 'master' into EditFormulaItemOnClickBrick

Conflicts:
	catroid/src/org/catrobat/catroid/ui/adapter/BrickAdapter.java
removed MergeConflict in BrickAdapter
added new JUnit-Test-Class for testing all FormulaBricks
added licensheader and deleted logs and spaces
Merge pull request #514 from Catrobat/EditFormulaItemOnClickBrick

Adding "Edit formula" option item on click brick