Feature/sections sm1

This Pull request contains UI changes for section details. The following changes are included in section_details.html
1) Added UI design for empty section
2) Corrected the link to ‘All sections' in section_details.html
3) Displaying user role and user ID with appropriate  UI styles. 
Yes, the user friendly descriptive text  " All section" is to take the user back the the view that displays all sections for this course. And the url for that is 'create_section_form'