Changes in MainMenuActivity according to the new Mockup:
- [x] the icons are the same size
- [x] the background of the Buttons has a grid pattern drawn on it
- [x] the Continue Button shows the name of the current project
Changed clickOnButton to clickOnText in getIntoSpritesFromMainMenu
because Button text now also displays current project
changed ClickOnButton to ClickOnText in some tests because the Continue
Button now also contains the current project as text
Added Test for the current project preview on Continue Button
Modified test to see if the name of the current project indeed is
displayed on the continue button
Use projects from UiTestUtils
Merge pull request #178 from Catrobat/RefactorMainMenuActivity

Refactor main menu activity
Merge remote-tracking branch 'origin/master' into FormulaEditor

Conflicts:
	catroid/res/values/styles.xml