Merge pull request #176 from objcow/master

Fixing mathjax rendering
Merge pull request #177 from objcow/master

Fixed solution collapsing
Merge pull request #178 from objcow/master

Fixed problem/solution deletion JS hooks
Merge pull request #179 from objcow/master

#148
Bugfix: Show solutions in download when we are supposed to
Bugfix: Add solutions in txt files as well.
Import ExerciseHidden exception from the correct source
Grammar: Change "asked an exercise" to "added an exercise"
Grammar: More minor changes

More cases of Asked an exercise changed to Added an exercise
Fix some cases of Frequently Asked Exercises back to FAQ
Grammar: Change "Frequently asked exercises" back to FAQ
Grammar: Change instances of "Asked first exercise" to "Added"
Merge pull request #182 from objcow/master

#166
Update README.rst
Merge pull request #3 from JDShu/master

Resync