-Added ProjectParticipant Table to Content Provider. Not tested yet.
-Fixed some Bugs in SQL Database
-Added possibility to Exclude participants from items.
-Added Project Participants Fragment not tested.
-Fixed Cursor bug in Project Overview.
-Made some changes to Ime-options of Edittexts in add_item
Merge guis_for_chrissy into itemListFragment_and_addItemActivity
Merge guis_for_chrissy into itemListFragment_and_addItemActivity