added label (indicating percent complete or other measure of progress)

to center of the spinner
still needs work on positioning and scaling of text when radius changes
update css to center label text
add a label to center of spinner
add a label prop to use instead of the radius in testing
run make to update dist and minify

added label prop, replacing radius used in testing
Fixed ARIA attribute name.

Reference:
http://dev.w3.org/html5/markup/aria/aria.html#aria.progressbar
https://developer.mozilla.org/en-US/docs/Accessibility/ARIA/Web_applications_and_ARIA_FAQ#Can_you_show_me_an_example_of_ARIA_in_action.3F
Merge remote-tracking branch 'remotes/brianhatchl/percent-label' into percent-label

Conflicts:
	dist/spin.min.js
	index.html
bumped version number
Added an option to control the direction of the circular motion
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages
Added a dropdown to toggle the direction
Made the preview bigger
Added direction setting to the live-docs
Use the UMD module pattern
Added .jshintrc
Use strict mode
Removed some unused markup and CSS
Added a jQuery plugin
Use the bundled plugin
Added a require.js example