Both rb-site and prepare-dev.py deal with a lot of text, and it can kind

of blend together, particularly as operations are being performed

(database synchronization, for instance).
To help distinguish parts of the setup, we now display color output for

headers, prompts, errors, notices, and success indicators.
Headers also have a visual separator, making it very clear what section

some content is in. This replaces the simple asterisk that previously

proceeded a section title.
Color is only enabled if the terminal supports it (piggybacking on the

color support for Django management commands). --no-color can also be

provided to disable color.
Text content will also now fit the width of the terminal when run on

Python 3.x, which helps with cutting off content prematurely. This makes

use of shutil.get_terminal_size(), which is a standard way of returning

terminal dimensions.

Created a new site. Checked that all color output was as expected.
Set up a new dev tree. Verified the color output there as well.