Added config parameters for video chat service
Fixed a bug in list_users
fixed a bug preventing user help message loading in case of more than one switcher per provider
fixed bug when sending email to assigned tutor and provider has more than one switcher
Removed video-chat config
Added gitgnore e videocaht_config_DEFAULT file
fixed a typo that forced all registration emails to be sent from ADA_ADMIN_MAIL_ADDRESS and not from provider's own admin from the DB
Merge branch 'upstream/master'
Merge branch 'master'