New dashboard feature
Remove $log and fix a typo bug in dashLoader.js.
Clean up default-ts.json and default-nts.json.
Remove unnecessary required time_field setting from histogram panel, it will get time field from filter service now.
Merge branch 'addel-develop' into develop

Add New dashboard button feature and related bug fixes.
Merge remote-tracking branch 'upstream/develop' into develop
SILK-133 the first version of right/left legend