improved tooltip styles, add multiple highlight points, and changed highligth size when graph plotted without points.

Import: Fixes to import from json file and import from graphite. Issues was lingering state from previous dashboard. Closes #840, Closes #853

Annotations: Fix for annotations not reloaded when switching between 2 dashboards with annotations, Fixes #851

Dashboard: when opening search or dashboard settings, click the icon again will now hide the view, Closes #836

Extreme values that go beyond the screen resolution are very likely to be misplaced. This is a simple workaround. A better solution would be to improve the code placing the tooltip and make it handle tooltips containing more content than they can safely display.

Elasticsearch: fix for issue when saving dashboard with title equal to slugified url, would cause the backward compatible fix to delete it, Closes #828

enable withCredentials in elasticsearch basic auth

add override options to allow multiple stacks

Handle 'group' graphite method

Update playlist.html