created new NFC branch
changed api level from 8 to 10 and create new activity for NFC stuffs
fix typo
created second NFC activity, replaced the first one
started NFC communication implementation, this way blindly coded and not tested
fix nullPointerException and create an NDEFMessage correctly
First working NFC communication, still need to retrieve group informations from its ID and launch the GroupMainActivity. Warning, the new functionalites are  not tested nor bulletproof at all
Added NFC code to GroupsActivity (receive) and GroupsMainActivity (send)
Merge branch 'NFC' of https://github.com/lca4/unison-android into NFC
spelling mistake
Fixed a bug in GroupMain where dispatch was called instead of push. Added a solution to update the history after finding out a group has been deleted from the server
merge NFC into master
Merge branch 'NFC'