Description
when e.g. rebinding to & rerunning active tasks (for example: /hello_world20121114-203102 --root ~/.thermos/ --task_id hello_world20121114-203102 --json ~/.thermos/tasks/active/hello_world20121114-203102), it's currently necessary to specify:
a) sandbox
b) task_id
c) config file (task config)
at the very least, we should be able to retrieve a) from the header, which is already parsed by other commands (e.g. thermos status)