Support RawJSONStream option for PushImage.
Merge pull request #158 from nitrous-io/push-image-raw-json

Support RawJSONStream option for PushImage
DRYing up creation of X-Registry-Auth header

Conflicts:
	image.go
Create tar stream for user with specified context dir
Removing support for go1.1
[TRIVIAL] removing extra comment line [ci skip]
Removing comment per feedback
Oops, adding to headers instead of reassigning
Spiking on `docker exec` support
Progress on `docker exec` support
Add Search image capabilities
Add docs for exec functions
exec: Remove `else` block from `StartExec`
exec: Minor cleanup on path building
remove empty line, add json and yaml struct for SearchImages
Adding unit tests for the exec APIs.
exec: Add links to docker docs
exec: Make use of `fmt.Sprintf` instead of string concatenation
set corrects tags for both yaml and json
Merge branch 'feature/searchImages' of github.com:jbdalido/go-dockerclient