Closes #34. Use bundle update in wizard in order to correctly resolve jquery_rails dependency

I have tried upgrading to jquery_rails 3.0, but they have stopped including jquery_ui. Instead they recomment using jquery-ui-rails, and in turn we'd have to modify application.js and test that the jquery ui templates work correctly. It can be done, but I guess this change would make sense in the Rails 4 branch.

As a workaround, I suggest we exchange this "bundle install" for "bundle update", and push "Hobo 2.0.1". This way new users will be able to install Hobo without an ugly error :).

What do you think? @bryanlarsen , @Barquin