Switched to the tomdoc style of rdoc.
Removed Ruby 2.0.0 requirement from Gemfile.

The Ruby version requirement in Bundler is IMHO broken as it prevents us
from specifying several compatible Ruby versions. Whatever the intended
semantics of the Bundler restriction, the current Gemfile prevents us
from using proiel-webapp with Ruby 2.1, which is supported, in addition
to Ruby 2.0.
Updated Ruby version requirements in documentation.
Updated testing/development only gems and merged into Gemfile group.
Enabled normalize.css across the site and inclusion of Semantic UI style files.
Redid sources#show using Semantic UI.