Ignore the tmp directory
Require ruby 2.0+
Implement OAuth support

Big props to @bloudermilk in #60 for helping lead the charge
Add expenses_by_project and allow remaining options to be passed in

Big props to @jordanyeo for the original implementation in #56

and to @parndt for the idea in #70
Correct the user agent
Bump the version with a major and a release candidate

I'm not 100% sure about some of these breaking changes, and if there
may be more. So going to release it as rc1 to start with.
Drop pending spec
Dropping this spec