Send Reddit Message to users when voting privilege granted/revoked

Sends pm to user any time a VoterEvent is inserted

resolves #20
Fix date formatting
add css and png for spritesheets
add timezone to datetime strings
Minor admin modifications, add link to poll in ballot view
Add prov argument to poll and results views

Use ?prov=True at the end of urls to view results with provisional ballots included.
Add team logos spritesheets

Two sizes of spriteshees available with 23x23 and 30x30 logos.
Team has new method, logo_html(size). If the size requested is available as a sprite, returns html for the sprite. Otherwise returns standard img tag with the url for SI's CDN.
User has new method, name_with_flair(size) which uses team's logo_html method to generate flair followed by nickname.
Replace all instances of logos with new methods.
Merge branch 'master' into logo-spritesheet

Conflicts:
	cbbpoll/templates/ballot.html
add flair to provisional ballots
Merge pull request #28 from brandonsato/application-form

Adds About page.
Merge pull request #29 from brandonsato/application-form

voter selection blurbs
reverse name orders for str(Team)
team name fixes migration
Add pollster management and pollster list

Management is accessible via admin panel
Modify User.is_pollster to be a hybrid property
Add conference property to User
Merge pull request #30 from brandonsato/pollster-overview

Add pollster management and pollster list
Rename pollsters page to voters

Kind of nitpicky, but I think "pollsters" is a term for people who
conduct polls.
Change pollsters page to voters page

Missed one.
Add permalinks to results
add voters failing to submit ballots to resulttable
add updated time to ballot