wrap resizeSlabs() with load binding it will wait until document is read...

Fixes cases where slabtext is adjusted before custom font is loaded. This issue usually happens on the first page load when @font-face is first being loaded.

![screen shot 2013-05-29 at 4 20 45 pm](https://f.cloud.github.com/assets/93699/582251/75bfc6aa-c8b6-11e2-9857-826e4642cce6.png)
![screen shot 2013-05-29 at 4 20 59 pm](https://f.cloud.github.com/assets/93699/582252/75bf4f90-c8b6-11e2-91b0-d537c3e28add.png)