set get should return None for empty sets. fix bug with set members get
a more idiomatic way to define injections
tests for sorted sets
codestyle
Merge branch 'develop' into redis-sorted-sets
Merge branch 'develop' into redis-sorted-sets-part-deux

Conflicts:
	storehaus-redis/src/main/scala/com/twitter/storehaus/redis/RedisSortedSetStore.scala
Merge pull request #152 from softprops/redis-sorted-sets-part-deux

Redis sorted sets part deux