Bug 1090819 — Add git revision and branch to the loop-server homepage if available.
Bug 1099144 — Use redis hashes & sets for SP urls.

Uses redis hashes and sets rather than normal keys and doing a keys with a "*"
in the lookup part. Doing so costs a lot to redis and it uses a lot of CPU to
compare the keys before returning the values.

Using hashes and sets reduces a lot the complexity of the calls (going from
O(Number of keys in the database) to O(Size of the hash) + O(Number of sessions
per user).
@natim review.
Merge pull request #251 from mozilla-services/1099144/fix-redis-simplepush-with-keys

Bug 1099144 — Use redis hashes & sets for SP urls.
Backport 0.13.2 changelog.
Merge pull request #249 from mozilla-services/dev-commit-rev

Bug 1090819 — Add git revision and branch to the loop-server homepage if available.
Fix changelog bugs number for 0.13.2
Fix filter names for redis.

We were using "val" everywhere which doesn't convey any meaning, we are now
using the type of the list we're manipulating (call, url, room).
Merge pull request #255 from mozilla-services/better-filter-names

Fix filter names for redis.
Merge with master