Update Gems and move to OneLogin ruby-saml

Rails 3.1.1 -> 3.2.12
thin (instead of webrick)
sass-rails 3.1.4 -> 3.2.6
coffee-rails 3.1.1 -> 3.2.2
Update Gems and use OneLogin ruby-saml
saml_controller changes due to OneLogin ruby-saml differences

Mostly settings were moved from .new to create/generate
Settings.rb now used to fill in hash.
pull logout service URL from @settings
Simple start script