Now description can be added to the board columns. They can be added on creation and changed later.

This is useful since the columns may have different names in different projects and a short name might not be very meaningful. Also, this can be used to let others know what qualifies one item to be in that column. For example, a checklist.

There are pending items which needs to be fixed:

- Ideally, the small icon next to a column name in board show the
  description when mouse hoved. This is done with simple tooltip now.
  that should be similar to task description popup.
- Markdown support
A simple placeholder for do some kind of white labelling.

This just add a header with a logo on top. One can change the logo to his liking. The logo should be of size 215x60 and in png format.