fig patch for docker v1.4 volume management

Related to issues #723 and #622. 

Seems that docker 1.4 breaks the way docker-py binds volumes.
But as stated by @cpuguy83 on opened issue on docker-py: https://github.com/docker/docker-py/issues/419, seems that it should be fixed on docker or docker-py. 
(On https://github.com/docker/docker-py/issues/419 is explained why fig does not bind-mount volumes on docker >=1.4)

This patch works for me, and seems backwards compatible with docker (tested 1.3.2 and 1.3.0).

As short description, it only pass `volumes` parameter to `create_container()` if it's not a bind volume, because otherwise docker >=1.4 and docker-py <=0.6.0 wouldn't bind-mount the volume. 
The `binds` parameter to `start()` includes the correct `binds` parameter.

But I don't know if fig has to be patched like this.
Other option is waiting for a docker or docker-py patch, and then update fig if still needed. Seems at least dependencies will have to be updated.