Added completeTask.js
Added requirement for new js
added start, end, and hire buttons on the task modal.
worker can't see hire button.
Merge pull request #18 from StanfordHCI/nr-btnOnTaskModal

added start, end, and hire buttons on the task modal.
Merge branch 'master' into at-completeTask
Added a status field to the event objects, have two events firing on a start task and a complete task button that updates the status of the task