Generate report named "contributor" that accepts two parameters, username and a list of groups.

#8 (moved)

1. Included only the issues which are open
2. Added the Done section for closed tickets and order issue by their closed date
3. I have included the subgroups milestone and their issues status.( which I fail to do in my first commit or merge)

#7 (moved)

1. In progress and Done subsection layout is unique
2. report generated for assignee with due date
3. Done subsection displayed with closed issue date