CMFileManager : Beam to send files

Added support to be able to beam files via the file manager.

Steps :

    1. Select one or multiple files via checkbox
    2. Tap phones to beam file over
    3. Enjoy !

Patchset 2 : Switch to callback
Patchset 3 : Remove debug messages
Patchset 4 : Add check to avoid crashes on devices without nfc
Patchset 5 : Rebase

Conflicts:
	src/com/cyanogenmod/filemanager/activities/NavigationActivity.java

Change-Id: I005db2ebdabc0e83a92ae820cb98f73709d5f535