Show transition in desktop mode on IE8 and below

* Use respond.js to interpret media queries as Bootstrap suggests: http://getbootstrap.com/getting-started/#template and https://github.com/scottjehl/Respond
* Use conditional IE classes to fix rendering of header to it's consistent cross browser

![screen shot 2014-03-12 at 18 31 46](https://f.cloud.github.com/assets/319055/2401317/9ed61cac-aa14-11e3-9388-83e614ebf342.png)