Update static/js/jquery.switch.js

- Changed the use of .attr() for .prop() which is the correct way of setting element properties. This change makes the plug-in compatible with jQuery 1.9.0.
Update static/sass/bootstrap-switch.scss

Changed width lengths to numbers that are divisible by 3 and changed percentages to 33.333333% (it's recommended to use up to 6 decimals for calculations). This way the movements can be set to 0% and 50% respectively and everything is close to pixel perfect (it was not displaying correctly in iOS before).
Merge pull request #4 from t3chn0r/master

jQuery 1.9.0 compatibility and pixel perfect calculations