Refactor to not depend on martini-contrib/auth

This release includes a refactor of the SecureCompare function both to make it faster / less redundant and to make it not depend on martini-contrib/auth.

Thanks @moorereason!

Initial release plus a bug fix

Looks like this repo was never tagged. It should have been tagged with v0.1.0 upon release. This tag suffices as the initial tagging plus a fix to a but where authorizing a request from GitHub would close the request body such that it could not be read by subsequent function calls.