add marked from https://github.com/chjj/marked (current master)
Changes for Looker (wip)

- some branding (to be templatized soon)
- added use of marked for markdown in desciptions (more soon)
- hide the validation and login stuff I'm not ready to use yet
- add missing null check
Merge pull request #1 from looker/add_initial_looker_changes

Add initial looker changes