adding missing unittest2 dependency for Python 2.6
Merge pull request #138 from pyfarm/task_error

Task last_error column
Include dependency on requests library
Bugfix: Only mark jobs with no tasks left as done
Count agents with only done/failed tasks as idle
Merge pull request #139 from guidow/scheduler_bugfixes

Scheduler bugfixes
Merge branch 'master' of github.com:pyfarm/pyfarm-master into content_type_check_fix