Refactor Sass to use nesting
Improve run & power button size and feedback
Bigger assignment text.
Eliminate some slim vertical gaps.
Move opal.js.erb to vendor/assets/javascripts
Replaced textarea with CodeMirror with a little styling
Next-line indicator now points to the correct place.
Highlighting the current line of code in the editor
Moved console-font-size into a variable
Split step into two parts: bolding the exact expression being executed, and
Split out a new stage of each step: moving the arrow with a CSS animation
Split output and unbold steps
Animate each letter of the output
Bug fix: cursor wasn't snug against the last character output
Subtle background color for console output so spaces are visible
Bug fix: cursor was a little too tall, was forcing lines apart