unify dashboards with default interface, use proper javascript framework

[Dieterbe]

dashboards should be:

• editable through web UI(add/remove queries, edit queries, set default value for apply to all)
• saveable and loadable through web UI

the default interface:

• should be able to add more queries
• should be able to hide the query stats section to save space.

=> both features can be merged into one interface.
ideally using something a proper js toolkit like Angularjs, which would be beneficial anyway because right now the templates are a little messy and we have some explicit javascript/jquery logic that could be simplified by using a js toolkit that does databinding. It would simplify the code and provide a clean separation between api and frontend.

[Dieterbe]

very early beginnings.. https://github.com/vimeo/graph-explorer/tree/angularjs doesn't work yet.
cc @zehome