Replace test_app for dummy app
Ensure document format type validators to return a boolean
Remove MissingNifException
Refactor cif validation method to allow character ended cifs
Remove NifValidator from Nifval module scope
Configure dummy app and spec_helper to use it
Remove Gemfile.lock from control version
Move NifValidator class into a separate file and autoload it when required
add some file types not wanted in control version
Update gemspec with rspec-rails dependency