fixed periodic tasks/added celerysettings config
testing cron with memoize
clean up test code
added celery documentation, switched to optional_parameter_call, minor fixes
added celery documentation, switched to optional_parameter_call, minor fixes
merge resolved
Merge branch 'master' into stkomarov-fixes
more periodic tests
Merge pull request #7 from edx/stkomarov-fixes

Stkomarov fixes