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 
The section name is passed in to avoid making anther backend call in additional to what may be an expensive call to get section enrollments. The api call  to get enrollments doesn't return the section name  and hence another  call would need to be made to fetch the name. Since the name is already available in the previous view, it is passed in along with the section id to improve performance. 
I agree that it could be passed in as a RESTful URL pattern along with the section id, rather than a query parameter and thus avoid additional checks to see if it exists.