setup moc
new entities
Merge branch 'Mensa' of https://github.com/Uni-Heidelberg/Uni-HD-App into Mensa

Conflicts:
	uni-hd/UHDMensaViewController.m
actionsheet
MensaModelSketch
more uiactionsheets
select mensa
changed "Staircase" to "Section"
sample data adapted to mensa model
Merge branch 'Mensa' into develop

Conflicts:
	uni-hd.xcodeproj/project.pbxproj
restructured project folders