Merge pull request #3 from LoicMahieu/master

Update _mixins.scss
update doc
Version 0.1.3
grunt connect
Fix bug enter value
Update doc; update demo; build
Version 0.2.0
Replace `throttle` by `debounce`.
$.throttle is fine for events like `scroll` but in our case, $.debounce is more accurate. Using `debounce` makes the event trigged only when the user stop to increment.