feat(plugins): good progress on converting query editors, graphite's query ctrl is now working as is unit tests

Conflicts:
	public/app/features/panel/panel.ts
	public/app/features/panel/panel_directive.js
	public/app/plugins/datasource/grafana/module.ts

removed /app route, confusing when some assets use public/app/.. route and some use just app/... all public static assets should no use public route, app route is no more

Log fixes

Allow the use of auth and credentials in opentsdb

why else would it be defined?
and this is sane anyway.

Add secureJsonData field to appSettings model

set cookie could potentialll leak information about the
datasource if in proxy mode.

closes #3845