sorting functionality for username, firstname, lastname, and section on marks spreadsheet
adding sort_by cookie for grades
asc/desc works over pagination
sorting works with per page drop down
Jump to works only as for last name, so dont display it for other sorting orders
Fix indentation, and push ordering into get_filtered_items method
limit sorting to tas and admins
only display section for tas and admins
adding functional test for cookies in grade forms controller
Push sort and order into query. Fix line characters to 80
strip out uncessary fields in pagination helper
FIX for issue 958, change single quote to double so that removing works
FIX for issue 619, fixed sorting on columns that contain html
Fix; creates grace period and penalty objects at proper time
Add check for invalid date format
Merge pull request #964 from akwok18/issue-619

FIX for issue 619, fixed sorting on columns that contain html
Merge pull request #975 from yc2lee/issue-958

Issue 958
FIX for issue 963, Add html_safe and fix spelling errors
Resolved conflicts during merge
Merge pull request #970 from m-bodmer/issue963

FIX for issue 963, Add html_safe and fix spelling errors
Closes #963