First pass at adding a jitter to schedulers. Move Validator to config_utils.
Update scheduler_parse interfaces to take a ConfigGenericSchedule.
Add jitter to constant scheduler, and some test cleanup.
Add jitter to general scheduler.
Update scheduler docs, Resolves #136
Adding action_runner.py and tests.
Adding action_status script to read the action_runner status file.
Merge branch '136_scheduler_jitter' of github.com:dnephin/Tron into 31_kill_running_actions
Working action runner for tracking running actions.