Feature/sections sm1

1) Backend changes for sorting the list of users in the section(TLT 311 backend) . Sorting by 'sortable_name' field provided by Canvas. UI integration to be done after Roderick's design
2) Changes to pass in section name to section details screen so that section name is displayed(TLT 297)
3) UI integration for section details screen
4) A few test cases to check for section name attribute 
Ditto on the comments for the above test.  Also, I think you could be a bit more specific with the method doc comment.