Enhancing user statistics
Added ability to compute statistics for a user
Fixed issue where latestSession was named lastestSession.  Wired up user summary page with new stats
Added pretty total days, hours, minutes, second format.  Flipped position of first and last sessions on summary
Made avatar width and text width interdependent based on a variable
Added longest session
Added duration to first and latest sessions.  Cleaned up formatting on pretty hour, minute, day method