Updated to run on Ruby 2.0 as of October 2014

reijiro seems not having maintained for more than two years.
This PR make it runnable on up-to-date environment (still on Rails 3.x though)

This PR:
- Runs `bundle update` as some gem cannot be found nowadays (for instance, old Gemfile.lock requires capistrano 2.13.4 while its latest version is 3.2.1.
- Changes debugger to byebug, as debugger is not supported for Ruby 2.x (https://github.com/cldwalker/debugger#known-issues).
- Specifies 'progressbar' in Gemfile as this gem is used during setup process.
- Specifies 'require spin' in Gemfile explicitly, otherwise I see error.
- Updates jquery.plot as old version still used [jquery.browser which is removed as of jQuery v1.9](http://jquery.com/upgrade-guide/1.9/#jquery-browser-removed).
- Introduces [bootstrap-sass](https://github.com/twbs/bootstrap-sass) gem so that we don't have to keep up with update of jQuery manually.
- Unwraps sass filter with script tag because as of haml4.0 sass filter output script tag http://rubydoc.info/github/haml/haml/file/CHANGELOG.md#4_0_0

I'm not sure if I didn't break things because I don't know how reijiro supposed to work. Please let me know if I broke somethings :3 I'm more than happy to make additional changes if necessary.