add task model to models.py
fix typos in models.py, add related names
add migration for new task model
add task to admin
add another migration to make claimed_by nullable and fix typos in models.py
added code to retrieve users and tasks from rest api
add threshold to task serialize field
add timestamp to tasks
move procfile
add more fields
turn off timezones
add tasklist
merge models with master
Merge branch 'master' of github.com:leeonlee/umd