Smart roles UI

Reduces the UI to a single Manage component, which shows or hides elements based on user's role (using the new AuthHelper)

Various bugfixes

See merge request !14

Bump Substance to include image upload fix, and make filtering smarter to fix contributor not seeing own posts.

Cleanup for 0.2

Mostly production configuration fixes.

See merge request !13

Adding Contributors file

This is a request for feedback on the contributors file. Let me know if anything needs changing and I'll make the alterations then make a merge request.

See merge request !9

Cleanup for 0.2 release



See merge request !12

HtmlWebPack plugin attempt #1, so that assets in the production build would be cached based on hash.