sort courses active first
Merge pull request #114 from jamox/course-view

Sort courses active first
basics of course emailer
minor fixes
added link to courses show view
added some basic tests
test basic functionality
cleanup
some more cleanup
minor fixes and renamerd user to sender
end of the commit
one should add files before commit
Fix migration name and down method.
Remove jamox's mail config from repo.
(minor cleanup)
Merge branch 'courseMailer'
Add course option 'locked_exercise_points_visible' (default true).
Fix describer for UnlockSpecs like "[n] points in [ex]".

Fixes #116.