Merge pull request #741 from etrepum/haskell-exercises

haskell pythagorean-triplet
Add a note to empty pending lists. Fixes #735
Hack seed script.
Explain next step on dashboard. Fixes #726.

When someone has completed the exercise(s) they're working on, there was
no indication on the dashboard of what they should do next, or how to do
it.
Add submission view count
Merge pull request #742 from Tonkpils/submission-views

Submission view count
Remove name from grade school exercise
haskell saddle-points