Start work on List class. I'm not quite sure what i'm doing here, but it seems to work.
List watchers will now scroll.
Worked more on list watchers - they now scroll mostly, and with a Scratch-style scrollbar.
Fixed scrolling.
Merge branch 'LLK/master'
Added guidelines for contributing code
Fixed look of the green flag over the HTML5 player.  Moved some styles into compare.css from compare.html.  Implemented debug logs for Javascript and Actionscript to compare the operation of both virtual machines.  Moved start and stop buttons above the players.
Add show/hide list blocks, fix list reporters, and fix show/hide var (issue was with multiple sprites having same local variable name).
Some list watcher style changes.
Merge pull request #30 from Scimonster/list-watchers

List watchers
Fixed conflicts, ready to merge.