group results by contributors
refactoring and indentation fixing
Merge pull request #365 from janno42/sort_results

group results by contributors
remove raven dependency, fixes #273
Merge pull request #368 from karyon/remove_raven

remove raven dependency, fixes #273
cleanup and speedup the fsr semester view
speedup results view
ExcelExporter: fix export colors. refactoring. fixes #302
ExcelExporter: move  styles into class variables
ExcelExporter: put all the styles into a dictionary
speedup user list
add a test ensuring that the number of queries in the user list is not linear to the number of users
Merge pull request #366 from karyon/speedup_queries

Speedup queries
Merge pull request #367 from karyon/fix_export_colors

fix export colors
show the "Evaluation" menu item for all students
semester view: show number of participants in all states. fixes #257