Merge pull request #2082 from heidimason/responsive

Bootstrap and Responsive (re-opening PR #2071 from @heidimason, against develop)
changed partial exercise icon
Merge pull request #2098 from jdklein/develop

More salient partially completed exercise icon (Fix for #2010)
Revised a few lines and fixed spacing
Merge pull request #2100 from heidimason/css_hotfixes

Css hotfixes
add missing semicolon
don't use var out of scope
add radix param to parseInt()
don't create global for var
define var before it is used
Merge pull request #2111 from mauk81/develop

add some jshint rules with fixes
Merge branch 'develop' of github.com:learningequality/ka-lite into responsive