fix precedence issue with line highlighting
remove unneeded css; fix slider resize bug & update callback bug
Merge pull request #41 from cemc/cleancss

remove unneeded css; fix slider resize bug & update callback bug
minor update to default
already called updateOutputCallback in the middle of this function
Merge pull request #39 from cemc/highlightfixing

fix precedence issue with line highlighting
added back david's border color on hover
adapted and simplified david pritchard's patch for enabling
multiple steps when left or right arrow key is held down
Merge branch 'master' of github.com:pgbovine/OnlinePythonTutor
fixed keydown handlers being bound multiple times
Merge remote-tracking branch 'upstream/master'

Conflicts:
	v3/css/pytutor.css
	v3/js/iframe-embed.js
	v3/js/opt-frontend.js
	v3/js/pytutor.js
fix typo