Fixed slider.less compile errors
Compiled slider.less to slider.css
Fixed border radius

Old value was 20px, less file for some reason used 4px, I think it's
better to use 50%.
Fixed round border

Original value: 20px
Less value: 4px
I think it's better as 50%
Added .slider-disabled to slider.less

Class needed for disabling
Disabled sliders with class slider-disabled

(still have to manually give them the slider-disabled class for now)
Added disabling, enabling, toggling functionality
Added isEnabled, better toggle, removed stupid data stuff.
Changed data-enabled to data-slider-enabled
Added specs for anything added for disabling

data-slider-enabled, enable, disable, toggle, and isEnabled
Updated README.md with new features
Added disabling example to index page
Added disabled slider event tests, fixed mouseup event
Added events for enabling/disabling + tests
Added less compiling to grunt file
No need for full path in slider.less with grunt task
Merge pull request #29 from rahatarmanahmed/dev-less-compiler

Dev less compiler
Merge remote-tracking branch 'origin/feature-disabled'