Added the student logs in spec.

 On branch rails4
 Your branch is up-to-date with 'origin/rails4'.

 Changes to be committed:
	new file:   student_logs_in_spec.rb
Merge branch 'rails4' of https://github.com/goldsy/expertiza into rails4
Added some comments.

 On branch rails4
 Your branch is ahead of 'origin/rails4' by 2 commits.

 Changes to be committed:
	modified:   spec/support/features.rb