Consider using glide for dependency management

[jgmize]

https://github.com/Masterminds/glide

This could ease adding dependencies as in #58 and optionally remove the need to check vendor into source control.

[oremj]

We purposely check third party dependencies in. We been bitten a few times by third party devs removing their project, moving their project or removing a tag. Checking the dependencies in also means commands like go get and go install will always work.