Speed up loading by skipping mapping parsing

This disables the parsing of mapping on dashboard load. The side effect is that field auto complete in settings dialogs will not work. For users with many fields or many indices, this can substaintaily speed loading times.

![screen shot 2013-12-04 at 9 49 32 am](https://f.cloud.github.com/assets/1250387/1675190/1d006b6c-5d05-11e3-9099-c7267118353b.png)