[WIP] Tightening up the visual design.

Now includes all files 

* Updates header and navigation to match those in the operator dashboard mocks.
* Uses form styles from style guide
* Matches preview to match the preview in the operator dashboard mocks.
* Strips away UI wherever possible, especially in the app selector, which was needlessly complex for selection of a single app.

Video: http://chuck.mn/0u3X3n422U3h
Or 

    .selectors {
      #only {
        > here {
          &to {
            :add {
              + specificity {
                ::because {
                  inheritance {
                    padding: 0 40px 0 10px;
                  }
                }
              }
            }
          }
        }
      }
    }