removing dotcloud/docker dependency.
Merge branch 'master' of github.com:fsouza/go-dockerclient into issue57

Conflicts:
	image.go
license: give credits to docker authors
utils: cleanup package

Related to #57.
utils: add copyright notes
engine: fix test on mac

Thanks Apple.
engine/helpers_test: do not depend on utils.TestDir
engine: add copyright banner to files
container: fix State type
container: import more methods from docker
testing: do not depend on dotcloud/docker
misc_test: fix bug in assert

Fix #57.
Godeps: remove file
Godeps: update Godeps.json