Removed unused parameter

drag_and_drop no longer needs the 'widget' parameter.
Added support for 'next robot'

Backside of robots can receive a robot that is run when the current
robot does not match. But see Issue #22.
Added new link in Github README

With a link to the Github pages.
Removed link to toontalk.appspot.com
Fixed a bug creating a backside with a 'next robot'

Was a typo
Various minor changes
Updated Constructionism paper

Fixed a spelling mistake
Updated talk link

To link to Google Docs presentation
Saved a convergent series example

Keeps adding half as much as before.
First in team runs when a robot repeats

Fixes #22.
Improved robot titles

Matching context is described better.
Next robot is now described too.
Ignores drop of front side on back side

Of the same widget.
Also renamed variable for clarity.
Added infinite stack support

So drag becomes copy. Fixes #3.
Updated computational thinking talk
Added CSS for infinite stacks
Copies from infinite stack sized conditionally

Only when dropped on a backside. E.g. not when in a box hole.
Fixed bug in robot trained to use infinite stack

Was generating the wrong action.
Compiled new version
Demo initialisation test files
Updated demo_init.html

Added some text.