Fixed rake issues

When I ran "rake", I got these errors/warnings:

  1. SECURITY WARNING: No secret option provided to Rack::Session::Cookie. This poses a security threat. It is strongly recommended that you provide a secret to prevent exploits that may be possible from crafted cookies. This will not be supported in future versions of Rack, and future versions will even invalidate your existing user cookies.

  2. Rack::File headers parameter replaces cache_control after Rack 1.5.

  3. Also:
     * `expect { }.should_not` is deprecated.
     * please use `expect { }.to_not` instead.

  4. "uninitialized constant Factory (NameError)

So I upgraded Rails from 3.2.2, changed "Factory" to "FactoryGirl", fixed "should_not" warnings, added less-rails and therubyracer gems. Then when I ran "rake", it was green.