Worked on playlist mode, hides dashboard controls and dashboard search button, added prev, stop, next icon buttons

added an inital admin settings view, very basic right now only displays all config options in grafana.ini

Configuration file options can now be overriden using environment variables using GF_<SectionName>_<KeyName> syntax, if Section name contains dots in config they are replaced with underscores, and the section name and keyname needs to be all upper case, #1473

Added two columns to user table, email_verified and theme, no used right now but will probably shortly

Small fixes to getting up and running

Fixes a panic: interface conversion: interface is string, not float64
when importing a dashboard that has a non-float ID.

Running "go build" defaults to building a binary named
grafana in the root dir.

Fixed links to user admin views, and backend html routes for user admin edit/create urls, Closes #1451

Events are passed in as PTRs, so we need to de-reference when getting the type and value.

Refactoring of grafana (root scope view model), into contextSrv, made sidemenu always hide after login