add bootstrap styles to more elements: assessment question feedback divs, Parsons problems feedback divs, Codelens buttons
Merge pull request #157 from isaacdontjelindell/activecode-issue-154

add bootstrap styles to more elements: assessment question feedback divs...
tweak RSI logo layout; make it link to RSI homepage
Remove dead/unused code from assess.js  checkme, checkMCMF, etc have all been replaced by their xxxStorage versions.
remove body top padding when navbar is collapsed
Merge pull request #160 from isaacdontjelindell/logo-issue-155

tweak RSI logo layout; make it link to RSI homepage
Merge branch 'master' into auth-issue-156