Refactor.

Change-Id: I3785a0b943576e8a4e59f8438d60411ee301e1e2
Refactor.

Change-Id: I03467f0223e9afbdb72f6983f1764c763b5b1769
Refactor.

Change-Id: If32f747f2a2c7d8f039853455ee70a3c6fe6543a
Add tests.

Change-Id: Iad06655f46e05475dad9379a71ba547616712b12
Remove probably dead code.

This code looks dead because expiration_date is blank=False, null=False.

If this code is needed there should be test to it.

Change-Id: I5478ad9b3c0609924c0722bace9a60f07b3a96d8
Test parse_facebook_response and make it more robust.

Change-Id: I4e61a3da0dcae80c1d226ba0ca44c954040e2a72
Fix debug_all_tokens_for_user.

Change-Id: Ieb188d149f5fe964f980ecfaf37a40d1a6367cb2
Add test.

Change-Id: Id6ebcfd7e428051ac1c7ae5020952240a999d945
Refactor.

Change-Id: I4b84eede5ab274d351455b185d6fedd9e09c9ae7
Refactor.

Change-Id: Id33c3afec540667f07e8963b5a2e2a9949eb8402