Add LoggerHandler. Change Logger and Server location

Make it more Pythonic. Now:
    from cocaine.services import Service
    from cocaine.logging import Logger
Instead of:
    from cocaine.logger import Logger
    from cocaine.service.services import Service

Also there is LoggerHandler compatible with the python logging.Handler.
Example:
   import logging
   from cocaine.logging import LoggerHandler

   Format = logging.Formatter("%(process)d %(levelname)-4s")
   Handler = LoggerHandler()
   Handler.setFormatter(Format)
   Handler.setLevel(logging.DEBUG)
   logger = logging.getLogger()
   logger.setLevel(logging.DEBUG)
   logger.addHandler(Handler)
   logger.info("INFO")