fix display of the actions bar
allow vertical resizing in editor area
don't wrap text at the end of the line
allow horizontal scrolling in editor area for long lines
increase height and line-height of editor
intercept source code change and remove potential formatting coming from copy/paste
stop running as soon as the content is changed
use correct stop method (whoops)
also update button view when a key is pressed while running
Merge pull request #2 from gabrielecirulli/master

Changes to code editor behavior
Fixed indentation on example
Removed redeclared variable
Removed duplicated jquery selectors
Changed caret color
Added contributions section
Merge branch 'master' into gh-pages