Auto-focus number input on backspace.
Merge pull request #1 from Bat-o-matic/master

Auto-focus number input on backspace.
Updated SIP.js to sip-0.6.4
Updated depreciated variable names in app.js
Image optimizations
Merge branch 'master' into gh-pages

Conflicts:
	img/bg.jpg
	img/screenshots/1.png
	img/screenshots/2.png
	img/screenshots/3.png