undo changes
fixed tools menu on api < 11
fixed tests
Merge pull request #68 from Catrobat/dialog_refactor

Dialog refactor
Implementation: @galstc05
Acceptance: @michaelmuenzer
Update README.md
added new color chooser tab icons, removed some icons not in use
added a bottom margin to the tab image to avoid overlapping of icon and
line-selector
custom overflow icon
Merge branch 'master' into 8.78_FileIO

Conflicts:
	Paintroid/src/org/catrobat/paintroid/PaintroidApplication.java
	Paintroid/src/org/catrobat/paintroid/image/PaintroidImage.java
	Paintroid/src/org/catrobat/paintroid/io/FileIO.java