Add player cards by date

Previously player cards were tied to a competition. This lets player
cards be created by instead specifying a start date. The stats will be
for all matches by the given player on the given team. This is handy
for the world cup because otherwise there'd be no stats at the start
of the competition.
Tidy the football admin and fix/add tests
Couple of admin player card UI fixes
Remove teams from football admin nav
Merge remote-tracking branch 'origin/master' into player-cards-without-competition
Tidy up based on PR feedback
Merge remote-tracking branch 'origin/master' into player-cards-without-competition
Merge remote-tracking branch 'origin/player-cards-without-competition' into player-cards-without-competition

Conflicts:
	admin/app/views/football/player/playerIndex.scala.html
Merge pull request #4073 from guardian/player-cards-without-competition

Player cards without competition