avoid constructing objects if not needed
update to Tomcat 8.0.8 for better performances

Fix issue: https://issues.apache.org/bugzilla/show_bug.cgi?id=56348
Merge pull request #250 from yanns/tomcat-8.0.8

update to Tomcat 8.0.8 for better performances
Merge pull request #248 from yanns/mini-fixes

avoid constructing objects if not needed