Organization user list styling

Left align column headings.

Replace two column full name with single column and a call
django-organization's method return full name.
Set border colour on responsive decision-list

Fixes changing of table colour on small displays
Add labels for responsive style discussion list

Adds field labels to the responsive discussion list styling.
Add responsive style for action items list

Can we find a more DRY solution to this? The styling and labels are
duplicated in CSS files and the list view code.