finished auto-update implementation

- miners update automatically according to their defined interval
- removed MinerConnection model; set host/port directly on Miner model
small whitepsace cleanup
0.1.10
updated development redis config
0.1.11
added heroku scripts
added MinerDevice, removed PoolConnection
PoolWorker support

- created pool and device fixtures
- ability to create new PoolWorkers in cgminer
- ability to remove PoolWorkers
- removed quota calculation from PoolWorker
0.1.12