Update specs to use new HTTP Runner interface.
Make rake dev dependency
Make rake jasmine:ci run specs correctly.

- Will replace rake core_specs.
- Remove obsolete dependencies & files -- most of these were for build tasks we
  are no longer using. Notably, rspec and spec_helper were deleted.
Use jasmine_selenium_runner to run specs via Sauce
Tunnel identifier must be a string

- Travis provides a float.
Really make tunnel_identifier a string.

yay.
Ensure tunnel_identifier is properly quoted for travis builds