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")
Adapt import statements.

In previous commit logging and services packages were renamed. Fix
import of this packages in code and example.
Rewrite perform_sync in Service as generator.

All of the improvements associated with synchronously access to the
services.
Fixes a problem with incomplete reading of the socket buffer, which
happens when using the service synchronously several times, as well as
for mixed use (asynchronously after the synchronous). As well as
properly processed error message from the service.
Merge branch 'v0.10'