histogram: option to set point radius
consistent top and bottom margins
do not show empty load/save dropdowns
Added sparklines panel
Added cache-busting token for loading elasticsearch dashboards
fixes #628
shorter timespan tooltip
Merge remote-tracking branch 'dpb587/patch-fix-iexplore-caching' into iefix
Merge remote-tracking branch 'topface/dropdown-visibility' into disableEmpties
Merge remote-tracking branch 'topface/css-fixes'
Merge remote-tracking branch 'jdve/pointradius' into jdve
Closes #600
Closes #653.
Closes #17
Merged upstream/master