Unittests for the watcher module and other changes
* cov.sh script has been modyfied in order to filter sources that
  can't be covered by unittests
* For now watcher api will be without out authorization because of
  Django authorization is not suitable here
* The type of car field has been changed because of we need track
  only type of car, the number does not matter.
* The profiles unittests class has been renamed in order to ge more clear