Provisioning dialog styling and conversion to CodeMirror

Updated styling; changed "Content" text field to utilize full width and height

![screen shot 2014-07-10 at 1 45 32 pm](https://cloud.githubusercontent.com/assets/1287144/3542698/091f62d2-085a-11e4-828e-2368bc57ad19.png)
![screen shot 2014-07-10 at 1 45 04 pm](https://cloud.githubusercontent.com/assets/1287144/3542699/091ff594-085a-11e4-9510-991592e16341.png)