Bump httparty and restrict rspec to version 2

I'm not sure if there is another reason to restrict the version of httparty, but it's causing conflicts with the sift gem(and I assume anything using a more modern version of httparty). I also restricted rspec because they have bumped major versions and made breaking changes to the api.
While you are in here, I think we can just nuke this whole conditional. Doesn't seem all that useful...