Standings table: Display elo change from last game in a new column as colored text.
Merge branch 'master' into display-elo-changes after upstream update.

Conflicts:
	app/assets/stylesheets/main.less
	app/services/EloService.scala
Remove eloColumn from main.less.
Display ELO change: Fix a number of issues after review.
Removed invalid css class.
Display ELO change: Rename EloChange to EloWithChange. Vertically align match arrows.
Merge pull request #1 from avanwyk/display-elo-changes

Standings table: Added most recent "elo change" value.
Changed Elo backend values to Double from Int.
Added missing changes from previous commit.
Added the EloService.recalculateElos() operation.
Removed the need to confirm matches.
Added a recent matches widget to the dashboard.
Added an HTTP action for the recalculation of ELOs.
Upped the elo k-value to 48.