fix(weekView): prevent ExpressionChangedAfterItHasBeenCheckedError error
fix(weekView): prevent ExpressionChangedAfterItHasBeenCheckedError error

Fixes #303

mattlewis92/angular-calendar,mattlewis92/angular2-calendar,mattlewis92/angular-calendar,mattlewis92/angular-calendar,mattlewis92/angular-calendar,mattlewis92/angular2-calendar,mattlewis92/angular2-calendar