Fix SILK-143: Null values in time filter when loading dashboard from gist
Add SILK-142: Help message for each panel
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 commit 'fb54c12dcae2c338b1550dfc8b5a5a76af86cfba' into tarek-develop

* commit 'fb54c12dcae2c338b1550dfc8b5a5a76af86cfba':
  Add SILK-142: Help message for each panel
  Fix SILK-143: Null values in time filter when loading dashboard from gist
Update README.md before officially release 1.4
Select subset of fields to be displayed in table panel left pane
Merge branch 'develop' of https://github.com/aadel/banana into develop