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 
I think it would be safer to provide the url to the section list here rather than rely on going back to the previous page via javascript.  It will future proof your code a bit in case there are multiple ways to get to the section details view, and it removes a reliance on the user having js enabled (although, I'm guessing our tools wouldn't function without javascript).