Unchecks the upstream dependencies checkbox by default
Merge pull request #346 from Houzz/uncheck_upstream

Unchecks the upstream dependencies checkbox by default
Uses less stack-intensive map in renderTasks
Merge pull request #348 from Houzz/stack_safe_map

Uses less stack-intensive map in renderTasks
Issue #338: Add “priority” property to task, to take into account in scheduler.get_work

- implement handling of priority property in Task and CentralPlannerScheduler
- add documentation about task priorities
- add tests for handling priorities in CentralPlannerScheduler
Merge pull request #338 from soxofaan/feature-task-priority

Add “priority” property to task, to take into account in scheduler.get_work
Fixed issue where the server was upgraded and the clients not
Merge remote-tracking branch 'upstream/master' into merge_upstream

Conflicts:
	luigi/rpc.py
	luigi/scheduler.py
	luigi/worker.py
	test/central_planner_test.py