Merge pull request #5 from tomekp/master

Delete user from workshop
Add docker support
Merge pull request #7 from mlevvy/docker

Add docker support
Add getting workshop emails
Do not allow duplicates in list
Fix deploy script
Merge pull request #6 from mlevvy/master

Add getting workshop emails
Fix database connection
Merge pull request #8 from mlevvy/master

Fix database connection
Use strings as keys
Merge pull request #9 from mlevvy/master

Use strings as keys
Fix wrong collection name
Merge pull request #10 from mlevvy/master

Fix wrong collection name
Add email ID and date
Merge pull request #12 from mlevvy/addMailIDAndDate

Add email ID and date