Preperations for 0.6.0

[ludeeus]

• Move all logging to this:

import googledevices.util.log as log
log.debug('message')
log.info('message')
log.error('message')

• Raise ConnectionException in all clases.

# Example:
raise ConnectionException(self._ipaddress, error)

• Redefine CLI
• Move all examples to CLI, and remove the examples dir
• Make Travis happy