Adds a manage.py script to assign reviewers to talks.

Requires that a 'reviewers' group exist, and that there are people assigned to it (otherwise it won't find any reviewers to add!).

It will assign up to 3 reviewers, where those reviewers are NOT one of the speakers, and that reviewer has not opted out of reviewing that talk. It will choose random reviewers from those with the fewest existing not-opted-out assignments.

remove starter project bits from the module repo

see https://github.com/pinax/pinax-project-symposion

Provides a better error message when a sponsor benefit text field is longer than the allowed limit.

It tells you how many words you've written!

Update symposion/templates/sponsorship/_sponsor_link.html

Improved reference format and used pk rather than id
- thanks to trbs for the suggestion