Access Log patches

Due a problem with play! custom logger, it was created a new /conf/application-logger.xml
(see http://play.lighthouseapp.com/projects/82401/tickets/448-play-dist-ignores-loggerxml#ticket-448-16 )

There was a problem in the accesslog/AccessLogFilter.scala class: if the request had no user-agent header, an error was raised
Version 0.6.0-snapshot

New version of the Server
Merge pull request #59 from giastfader/master

version 0.6.0