improved the code about the session management
improved the log4net config to set the file encoding to be utf8
added configuration schema
Refactored from Task pattern to Parallel.Foreach
Merge pull request #6 from semihokur/master

Refactored from Task pattern to Parallel.Foreach
added RequestHandlingModel configuration
support different request processing model
Merge pull request #15 from kerryjiang/master

update master