container: add Mounts to the Container type
container: add Mounts to the Container type

This is the type returned by the InspectContainer method. Previously, we
we're able to create mounts in the Docker 1.8, but unable to inspect
them.

Related to #350.

fsouza/go-dockerclient,paulbellamy/go-dockerclient,jefferai/go-dockerclient,tarsisazevedo/go-dockerclient,csrwng/go-dockerclient,swagiaal/go-dockerclient,liron-l/go-dockerclient,achanda/go-dockerclient,bboreham/go-dockerclient,cloudimmunity/go-dockerclientx,eliasgs/go-dockerclient,tarsisazevedo/go-dockerclient,davidstack/go-dockerclient,ybogdanov/go-dockerclient,csrwng/go-dockerclient,codekitchen/go-dockerclient,davidstack/go-dockerclient,lindenlab/go-dockerclient,ybogdanov/go-dockerclient