Remove standard Rails

We had both rails-api and rails installed, but are (thus far) set
up to use rails-api, a slimmed down version of rails that doesn't
autoload a bunch of junk we don't need.
Enable inferring of file type from location in rspec

New in rspec 3 (nonbeta), apparently they disabled test inference based
on file location by default.
Merge pull request #17 from tippenein/remove-std-rails

Remove standard Rails