Fix glyphicon class name wrapping in IE

Before
![before](https://f.cloud.github.com/assets/831974/1498798/edd8c206-4843-11e3-89bf-959898b65eae.png)

After
![after](https://f.cloud.github.com/assets/831974/1498799/ede1f9ac-4843-11e3-8c58-5eaf3e7c9d3d.png)