Add support for regex based series merging in InfluxDB

Graph: series override dropdown menu select did not work after recent commit that added typeahead to this dropdown

Help: added help modal, accessed by shortcut '?', the help modal only contains a list of all shortcuts right now but will be extended in the future, #952

Graph: fill below to series override option not automatically adds lines=false, as overrides, if you want lines just for the fill below series just remove the overrides, #940

Graph: New series style override option 'Fill below to', useful to visualize max & min as shadow for the mean, #940

InfluxDB: series lookup & typeahead is now handled by influxdb list series regex queries, Closes #888

Tech: removed jquery-ui and jquiery-ui-angular-drag-drop, replaced with native drag drop for angular, saved ~50kb in js libs, much cleaner & simpler usage, Also changed some behavior for drag drop, now panels are replaced when droped on (switch places), Closes #920

Graph: fix for bars not displaying, caused by change in recent commit, added unit test so it does not happen again

Speed search result parsing

Graph: fixed value formating for tooltip, need original data. flotcharts copys the data, so changes to value formats func after plot call does not affect the plot.getData() series