Large Jetty Container cleanup

+ Split Jetty 8 embedded into its own container.
  Jetty 7 is Servlet 2.5, Jetty 8 is Servlet 3.0
+ Updated Jetty 9 embedded container to use features in Jetty properly.
+ Removed jetty-common's Configuration, as configuration is no longer
  common across all versions of Jetty.
+ Bumped up Java version in Jetty 9 to 1.7
+ Bumped up weld and guava versions in Jetty 9
+ Made use of ContextHandlerCollection properly in all containers.
+ All embedded containers now include DefaultHandler as last handler per
  recommendations by Jetty project.
+ All embedded containers now log to java.util.logging, just like
  Arquillian does.