Add alliance_selections_json property to Event models. Associated manipulator tests.
USFIRST pages alliance parser
Datafeed for USFIRST alliances
Expose match time strings to API
fixes #992
return UNIX timestamp instead
update api docs
Merge pull request #1006 from the-blue-alliance/alliance-selections-1

Add alliance_selections_json property to Event models.
datafeed controller for USFIRST alliances
fix failing tests, expose both UNIX time and timestring, because Moar Data!
Change alliance selection format from dict to list
admin editing of alliances
Merge pull request #1010 from the-blue-alliance/alliance-selections-2

Alliance selection datafeed from USFIRST
show alliance selection on event details page
allow adding of alliance selections with CSV
Merge pull request #1008 from plnyyanks/api-match-time

Expose Match Times to API