Fix golint errors

[ojarjur]

I apparently forgot to lint this code before committing it.

We need to go through and fix all of the issues reported by running golint ./...

[whuang8]

Thoughts on running the linter during CI? I can work on adding it to the travis config if this is wanted :)

[ojarjur]

@whuang8 Adding a lint check to our travis config would be very much appreciated. Thanks for your help here!