Users should be able to edit their profile even with blanks in nickname

Fixes
https://github.com/softwerkskammer/NeuePlattform-Implementierung/issues/
219
Merge remote-tracking branch 'upstream/master'
Merge pull request #220 from leider/master

bugfix
use sinon sandbox in memberstore tests
refactor memberstore_tests and fix bug : call trim() in getMember()
add method getMembersForIds to memberstore
add function getMembersForIds to membersAPI
use only one call to database for obtaining all member nicks for mails in the list
remove unused require and fix inconsistent returns
tests and improvements for mailarchiveAPI
use improved mailarchiveAPI in the app
fix array comparison in test using JSON.stringify
threaded mail index
Add links to switch between threaded and not threaded representations
remove file browser app
Merge pull request #222 from dpolivaev/master

Mailarchive app milestone 2
Added date information to the invitation message text.
Merge remote-tracking branch 'upstream/master'
Adjusted static references to softwerkskammer.de -> they now point to softwerkskammer.org
Merge pull request #223 from NicoleRauch/master

Softwerkskammer.org