allow dashes in slugs of schedule names
Merge pull request #18 from trbs/master

allow dashes in slugs of schedule names
Add ids to sponsor images to allow linking to each sponsor's entry.
Update symposion/templates/sponsorship/_sponsor_link.html

Improved reference format and used pk rather than id 
- thanks to trbs for the suggestion
Added CONTRIBUTING documentation to repository
Merge pull request #21 from holdenweb/master

Tiny change to make sponsor entries addressable
orderings on schedules
include section name in schedule view
bump dev version
add published and hidden attributes to schedules
bump dev version
bump dev version
add schedule specific boxes
bump to dev51
use section name instead of section for box slugs
bump version to dev52
include keynote in presentation slots, release, bump dev version
updating requirements in base project
remove theme account from installed apps
match proposal kind slugs with hyphens