Parse-dashboard: Setting different themes (colors) for different apps

[oferRounds]

Would be awesome if the dashboard would support setting a unique theme for different apps.

I have 2 DBs for my app — one for Production, one for Stage — which are sometimes open simultaneously on the browser. So this would come handy as a mechanism to prevent mistakes (editing a row on one env, when you think you’re on the other one).

[warrenca]

+1

[dplewis]

Closing via https://github.com/parse-community/parse-dashboard/pull/838