added menuitem 'Split the bill' and testing layout of new activity
layout split the bill complete but hard coded checkboxes
implemented basic layout & added icons
DAO is now a singleton
finished 1st implementation of the user review (closes #5)
file doesn't belong here
database.properties must be ignored
added a column "user"
edited the padding in mainactivity
added a textview "total" at the bottom
Merge pull request #7 from wpinnoo/user_review

Merge branch