[71413144] edit tasks

Ability to edit tasks.
Also showing assignees with links.
[pivotal story](https://www.pivotaltracker.com/n/projects/889184/stories/71413144)
[71413144] refactor specs

This method now includes links to user's profiles
Merge pull request #73 from bitzesty/71413144-edit-tasks

[71413144] edit tasks