Partial implementation of sign out clear data
More clear data on different user login logic
Rough draft at generating new uuids on different user login
Reconstruct task list metadata task order using id maps on different user login
Forgot to start the thread
Delete task attachments
Fixed several bugs with migrating data after new user log in
Merge remote-tracking branch 'upstream/master' into 130307_sb_better_logout_logic

Conflicts:
	astrid/plugin-src/com/todoroo/astrid/actfm/ActFmLoginActivity.java
Clear deleted entities from database on different user login