Adding possible to rate again (overwriting old rating)
Fixed bug for when ratingcache does not exist.
Merge branch 'master_rerate'

# By Robert Johansson
# Via Robert Johansson
* master_rerate:
  Fixed bug for when ratingcache does not exist.
  Adding possible to rate again (overwriting old rating)

Conflicts:
	lib/letsrate/model.rb