Merge pull request #743 from NicoleRauch/master

Small fixes and improvements
call "simon" via "sandbox" now
call "sinon" via "sandbox" now (this time also instantiating the box)
unifying more code in frontend tests
messed printing by setting height to image - don't know what is wrong there
change the update script
updated moment-timezone
update dev-dependencies
fixed python typo in README.md
updated express related dependencies
embarrassing - forgot return on re-login :)
update some more dependencies
change gitignore to ignore few more files
changed references to "NeuePlattform-Implementierung"; now using "Agora"
Merge pull request #747 from draptik/master

fixed python typo in README.md
Merge commit 'a050f91c3b57f5cda51d83e0cad63fdbf7ef8b89'
removed unused code
fix for #748 + tests for sympa.js
Merge pull request #749 from leider/master

dependencies bump
more elegant error handling when subscribing / unsubscribing from groups