feat(drilldown link): better access to drilldown links directly by clicking the external link icon in panel header, fixes #1575

fix(graph): minor fix for hover tooltip when combined with a single series using stepped lines, fixes #2754

feat(timepicker2): temporarily removed the the option to define custom quick range, will have to be part of future issue, closes #2761

feat(panel fullscreen): completly changed how the fullscreen view/edit works, no longer uses css fixed position, yay, closes #2779

fix(timepicker): UTC now works in all scenarios I can think of, manual edit, date picker edit, #2761

feat(timepickerv2): fixed lots of minor issues and updated kairosdb and opentsdb data sources to work with the new date formats

feat(timepickerv2): more work on new timepicker, now absolute time mixed with relative time works, yesterday, this day last week, etc now work

fix(events): fixed handling of onAppEvents when used from rootScope, must supply localscope, can now be used in isolate scope scenarios

Added maxSeries option for groupByNode Graphite function

fix duplicate tag value suggestions and relax limit on /api/search/lookup

feat(timepicker): lots of big changes, moving to datemath from kbn.parseDateMath, moving to moment dates instead of native javascript dates

Default limit is 25 which is too small. Considering currently the
/api/search/lookup query isn't narrowed down by selected tag
keys and values (see https://github.com/grafana/grafana/pull/1433), 
the limit is set to 3000, this should be fine because people rarely
create new graph panel.

Fixed 404 error for robots.txt