Update vendored dependencies

[snikch]

This updates the Godeps directory with the current master version of all dependencies. This builds and tests pass.

It should be noted that best practice for libraries is to not include vendored dependencies in the vcs as this causes headaches when resolving dep trees. Since this is both a library and an executable, it would make sense for the vendored files to be in the cmd/sneaker lib.

[snikch]

Tests pass locally. I'm sitting here nervously looking at that Travis yellow dot.

[codahale]

Sneaker is a CLI tool first and only incidentally a library, hence the vendored deps. Thanks for the PR.

[snikch]

Fair enough, and thanks for the tool. I think I'm using it in a way not quite as you'd intended, but you should know it works very well as a library too!