Support COPY from JSON format in redshift
Merge pull request #352 from fuziontech/master

Support COPY from JSON format on Redshift
record the time when the task picked up by worker
add task_search api to search for task by task_id
Merge pull request #354 from Houzz/task_search

Add task_search api to search for task by task_id
Merge pull request #353 from Houzz/time_running

Show the timestamp when tasks are picked up by workers
Merge branch 'master' of github.com:spotify/luigi

Conflicts:
	luigi/scheduler.py
	luigi/static/visualiser/js/visualiserApp.js