Servlet / listener / filter injection support for Jetty 7.2

The fix committed for WELD-729 doesn't work under Jetty 7.2. It appears that the Jetty API has changed between 7.1 and 7.2, which results in servlet/etc injection not working.

I haven't tested under 8.0 but I notice that the fix refers to 8.0M0, I had to update that dependency to 8.0M2 in order to get my changes for 7.2 to compile, which meant I also had to change the jetty 8 support to fix those compile errors.