add Vishal's master-worker code
Merge branch 'devel' into feature/master-worker
added README for Master/Worker example
Merge branch 'devel' into feature/master-worker
Merge branch 'devel' into feature/master-worker
fixx attrib deepcopy
simplify deep copy
fix deepcopy, again
acceept None as flag
remove tabs; fix loop detection
add sagapython-version
attempt to fix #351
Merge branch 'devel' into feature/master-worker
Merge branch 'devel' into feature/shell_job_notifications