Remove process pools and only use thread pools for services
Changing default thread pool size from 5 to 12.
Merge remote-tracking branch 'crits/master' into services_thread_process_pools

Conflicts:
	crits/config/config.py
	crits/services/handlers.py
	crits/settings.py
Adding support to SERVICE_MODEL: thread_pool and process_pool. Default SERVICE_MODEL is still thread/process so a user will need to explicitly set the model to thread_pool or process_pool to use them. The pools could be used in throttling CRITs services.
Adding for a way to control the service pool sizes.
Merge pull request #268 from thelok/services_thread_process_pools

Services thread/process pools