3.1.1 Release
Merge branch 'master' of https://github.com/ProfBMoriarty/PS3.1

Conflicts:
	.idea/workspace.xml
	aq1.0.js
	game.html
	game.js
	ps3.1.css
	ps3.1.js
	ps3.2.0.js
	site/download.html
PS 3.1.5 Release

1. The PS.gridShadow() function has been repaired and is available
again.

2. Two new functions, PS.bgColor() and PS.bgAlpha(), let you change and
inspect the background color and transparency of scaled and/or
non-square beads. Note: For backwards compatibility, the background
opacity is PS.ALPHA_TRANSPARENT by default.
Resolve merge conflicts from 3.1.5 release

The aq1.0.js needs to be double checked. I just guessed. Should probably
regenerate the minified version.
Update move.html example to 3.1.5
Merge master into md_sandbox