Replace .rvmrc with .ruby-gemset, .ruby-version.

This improves project support with different ruby version managers.
Upgrade to Ruby 2.0.0 and Ruby on Rails 4.0.1.

All existing files and configuration were fixed accordingly.
Move test dependencies to test group in Gemfile.

Add "require: false" as "cucumber-rails" suggests.
Use "strong parameters" instead of "attr_accessible".

Conform controllers and models with tools provided by Ruby on Rails
4.x.x.
Fix broken tests caused by upgrade to Ruby on Rails 4.

Change expected class of exception in helper method.
Format code.
Fix code after upgrade to Savon 2.2.0.
Format XML body of faked service response.
Upgrade db/schema.rb with one generated by Rails 4.

In particularly it replace hash operator from => to :.
Upgrade dependencies in Gemfile.lock.
shema rb