Swapping negroni for martini

I like the extra magic in martini; plus, it seems like it will be easier
to work with and easier to add to (i.e. basic auth)
Renaming license file
Adding martini-contrib basic-auth package
Adding basic auth stuff and some comments
Making linter happy
Adding go 1.3 to .travis.yml
Bump version to 0.4.1 in README
New feature: run the server in a Docker container
Minor adjustments to containers, etc
Adjusting bogus logging, temporary .dockercfg solution
Handling docker login through the environment
Merge pull request #58 from modcloth/evolving-the-server

Evolving the server