Fix/improve intellij IDEA iml 

No longer mark src/main/java as test (as well as main).  See https://github.com/Netflix/zuul/issues/29.  Note this doesn't fully fix that issue, but does produce valid iml.  Note also that for some reason, zuul-simple-webapp's iml doesn't have groovy src dir, but IDEA navigation/analysis still seems to see the code.