Rename session subscriber
Create session storage interface and data structure
Implement memory storage of sessions
Remove old file
Implement disk storage of sessions
Create session chain storage
Use session storage in subscriber
Allow passing in a different storage implementation
Fix login
Get username out of the query
Cookie authentication
Store the session and retrieve it properly
Separate service description into files
Add service description entry for user registration
Add Story submission to service description
Remove legacy client code
Document new usage in README