Update rspec to 2.99, add rspec-its, and fix deprecation warnings

With rails 4.2 hitting beta, master already relies on i18n ~> 0.7, so fixing deprecated tests and making sure they all pass.
Added to fix deprecation warnings relevant to:

    Use of rspec-core's `its` method is deprecated. Use the rspec-its gem instead.

All warnings thrown from `formatting_spec.rb`.