adding variable width labels and keys to forms
updating screenshots for forms
updating widths of key/values and control-groups/labels
updating examples and screenshots
Merge branch 'master' into variable-width-form-labels-keys

Conflicts:
	spec/skins/Windows 7/Chrome/screenshots_form-horizontal.html.png
switching to xsmall input size, aliasing mini
Merge pull request #2 from rackerlabs/variable-width-form-labels-keys

[Feature] Variable width form labels