column settings ui tweaks

- changes rv-style-guide to rv-common-style
- changed remove column button to '-' to keep consistent
- moved remove button to right side of div to allow for easier mobile selection
- built files
Merge pull request #82 from nexus-uw/bug/column-settings-ui-tweaks

column settings ui tweaks
[feature] Updated font-setting styling and added preview

Changing font directives to update scope when value is changed
Updated styling classes
Added backgroundColor field
Updated color pickers with type field
Added preview div and binding to update style