initialize triplets from random state

MAINT: comment out user ID to help with MTurk (#220)

docker: switch away from discontinued jessie-backports repo

BUG: install mongodb and launch next

Tested both locally and with next_ec2.py

Triplet validation filenames (#216)

* ENH: accept filenames for validation sampling

* ENH: Validation sampling takes string as input

* MAINT: better error handling

ENH: allowing video controls for videos on dueling bandits

(requires using primary_type: video-controls)

MAINT: have main link to /home

not /dasboard/experiment_list

BUG: dashboard couldn’t be viewed (undefined variable)

Also reverts docker-compose.yml in previous commit

BUG: dashboard couldn’t be viewed (undefined variable)

Also reverts docker-compose.yml in previous commit

modified dashboard to relative links