KAZOO-2515: support max_participants
Merge pull request #361 from 2600hz/KAZOO-2515

KAZOO-2515: support max_participants
KAZOO-2513
KAZOO-2513: cleaned up pull request
KAZOO-2513: cleaned up dialyzer complaints
KAZOO-2175: fix issue with initial account creation
normalizes envelope keys
Merge pull request #367 from 2600hz/KAZOO-2276

KAZOO-2276 normalizes envelope keys