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Conflicts:
	pipelet/scheduler.py
	pipelet/task.py

move compiling to worker to debug process mode + debug of cmb example + handle no user table exception

(cherry picked from commit f0ab83ab)

Correct outstanding bug introduced in web during performance improvements: interface failed to display segments without tasks

Conflicts:
	README.org
	pipelet/launchers.py
	pipelet/scheduler.py
	pipelet/utils.py

Seg meta are saved on disk after seg computation once for all

create index task_idx2 on tasks(queued_on);
create index task_idx1 on tasks(seg_id, status);

Supress the file tracking of segment meta-data due to a bug. This has to be reimplemented differently