add api framework and db models
implementd api framework.
add client framework
add implementation for lb-list command
add implementation for lb-list command
Merge branch 'alpha' of https://github.com/ljjjustin/nozzle into alpha

Conflicts:
	nozzle/api/loadbalancer.py
	nozzle/client/v1_0/client.py
purge conflict message
purge conflict message
add nozzle-server & nozzle-worker
Merge branch 'alpha' of https://github.com/ljjjustin/nozzle into alpha

Conflicts:
	nozzle/client/v1_0/client.py
fix some bug.
fix some bug.
Merge branch 'alpha' of https://github.com/ljjjustin/nozzle into alpha

Conflicts:
	nozzle/common/utils.py
fix some bug.
add common configuration for server and worker
alpha edition v1
fix some bug on logging
add some logging for nozzle-api
add rabbit notification
fix a import bug in nginx module