add rspec gem and capybara gem. add rspec validation test for full_name and email. start addition of capybara test.
changed filename student_feature.rb -> student_feature_spec.rb
added gem devise, ran bundle and installed.
Initial config for devise
Set up devise to authenticate on the student model. Reconfigured some views to allow self registration and confirmation of new students. Validation of parameters was disabled for now, to allow registration to work.