updated README
Merge branch 'master' of github.com:miku/gluish

* 'master' of github.com:miku/gluish:
  fallback to task_id if necessary
  added another test for effective_task_id
  v0.1.42
  collapsed ifs
  added effective_task_id()
  raise error if closest is invoked on a class with no date
  cleaned up parameter