basic support for tomcat 8

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/branches/tc8.x@1617630 13f79535-47bb-0310-9956-ffa450edef68
formatting

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/branches/tc8.x@1617631 13f79535-47bb-0310-9956-ffa450edef68
add contributor

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/branches/tc8.x@1617632 13f79535-47bb-0310-9956-ffa450edef68