Apptheme

[hdurand]

Adds theme to the app. Notes:

• About this line: https://github.com/okfn/app-theme/blob/gh-pages/js/main.js#L12. I didn't find any .pricing-panels element so I let this line in dashboard/dist/js/main.js.
• js files and libraries loaded in dashboard/dist/index.html should be loaded in bundle in gulpfile.js at some point.
• I made the overview section fit in the theme but it doesn't look like a 'light' solution. Also, on the source page, I don't know how period, timestamp and publisher could fit in the current overview section design.

[pwalsh]

Hi! From reading the code, I'm accepting the pull request. In order to be able to deploy this, though, to the example or the cabinet instance, we'll need all of #20 and #19 sorted.