Encode the room name in the /logs/:room/:day URL.
Escape HTML in usernames and message bodies to prevent XSS.
Merge pull request #13 from christhomson/xss-prevention

Escape HTML in usernames and message bodies to prevent XSS.
Merge pull request #12 from christhomson/encode-room-name-for-url

Encode the room name in the /logs/:room/:day URL