Support id arg from cli

[ConorSheehan1]

Most docker commands take an id or a name. e.g. docker logs
Currently (v0.1.2) osxdocker only supports names.

osxdocker/osxdocker/docker_logs.py

Line 41 in 356f9ed

def clear_log(self, container_name):

I see two main options:

1. Use one arg and figure out if it's a name or an id.

   def clear_logs(container_name_or_id):
       # this could be complicated / have edgecases. 
       # need to look into constraints for valid names and ids.
       if(container_name_or_id is name):
           # do something to convert to id

2. Use 2 kwargs.
   Would make cli more verbose, but handle edgecases.
   e.g. osxdocker clear_log --name foo instead of osxdocker clear_log foo.

   def getContainerId(id=None, name=None):
       if (name):
           # do something to convert to id
       return id