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's a bit risky to rely on a url parameter for section name when you can use the section id to retrieve the section details from the API.  Consider adding a helper method that retrieves section detail information from the API (using the SDK or an existing utils method) or a cache.  Getting this information from the API would guarantee that a name is present and that the name matches up with the section id.  It would also eliminate the checks below on whether the section_name exists or not.