Was not possible to upload summaries at all

They were not visible, now they are

Jan authored Jul 06, 2016 and Sébastiaan Versteeg committed Oct 04, 2016

Squashed commits:
[dd0f830] Use itertools.chain instead of +=
[9b56e66] Use settings.AUTH_USER_MODEL instead of Member as uploader
[84246e5] Use generator comprehension
[1271094] Rename summary_list to year_list
[02699ea] Preselect course when clicking 'add' in the course view
[07892ad] Don't use implicit uploader_id, use uploader directly
[49fe1ee] Change string concat to str format
[76d7358] Update translations
[ef0eb57] Use list comprehensions instead of map()
[51d7d03] unaccept = reject
[02d945a] Do not change translation util just for the migration script, use activate(lang) instead
[eea1516] Add localisation
[6ea4809] Add sitemap for education
[6aec215] Add actions to admin
[30c7864] Add forms to add exams and summaries
[495ebe2] Change submission url
[6521e3d] Add books page, basic forms and perfect download pages
[14fcca7] Make some small HTML changes
[009207f] Finish course view
[3a32dab] Change urls, translate texts and use absolute urls
[cc96cec] Rename stylesheet and use compressor, change text-align center
[56f77b4] Make sure that migrations really work
[3a18e56] Fix URL in and remove API key from education migration script
[25ae23c] Fix PEP8
[4e04316] Fix PEP8
[3078693] Add education migration script
[4e337e8] Correct course model translations, admin, ManyToMany relation and verbose_names
[0bbdd37] - Make categories and courses multilingual
- Define urls like the other apps
- Squash migrations
- Make texts translatable
[b3cecfb] Make texts translatable
[7bf745c] Code in pep8 format
[a434966] Summarries and exams downloadable
[394a109] Categories and old courses
[42a1c11] only show exams and summaries when they are accepted
[b562b6a] Basic page for course
[125ebb5] First version course overview
[55c0d06] Dynamic default dates should not be called
[5215f51] New migrations for education package
[f6ff3bf] added summaries in education model
[708bdf7] initial commit for education package