adding last_error column
updating schema representation to include 'last_error'
merging in changes from master
merging in changes from master
removing unused import
bugfix, attempts should not be += unless state is being changed
bugfixes for missing parent job (happens in tests), and proper += for attempts
should be using new_value here
adding some basic (though not comprehensive) tests
adding last_error column to responses, fixing a couple of attempts numbers
last_error would be reset
removing timestamp test, it's not really necessary in this case
Merge pull request #138 from pyfarm/task_error

Task last_error column