Adding demo example for Widget Button Toolbar
Merge pull request #146 from stulees/feature/widget-button-toolbar-demo

Adding demo example for Widget Button Toolbar
Widget Button Toolbar, proper attribute naming convention

- directive attribute `disablesave` updated to be `disable-save`
- directive internally now changed to use `disableSave` to correspond with `disable-save`
- demo updated to reflect attribute name change
Merge pull request #147 from stulees/chore/widget-button-toolbar-attr

Widget Button Toolbar, proper attribute naming convention
Widget Button Toolbar help and contribute buttons optional

- HTML template updated to use `ng-if` to either create or remove the Help and Contribute buttons based on the values provided in the attributes
- Directive updated to apply values to `$scope.helpRef` and `$scope.contributeRef` and check the existence of the attribute values provided
- Removed a useless e2e test line of code
- Updated demo example to mention the Help and Contribute buttons being optional
Merge pull request #148 from stulees/chore/widget-button-toolbar-optional

Widget Button Toolbar help and contribute buttons optional
[Fix] Column Setting component, column width input type

- Updated HTML template to specify `type="number"` for `column-width` input field
- Directive updated to set number values instead of string values for each default settings
Merge pull request #149 from stulees/master

[Fix] Column Setting component, column width input type