JBTIS-358, JBTIS-355 add new com.jboss.devstudio.integration-stack.*.feature features to the devstudio/site/. See hackaround on lines 77-92 of devstudio/pom.xml

JBTIS-358, JBTIS-355 switch from includes to requires, so installation is more flexible
refactor switchyard and fuse to o.j.t.i-s namespace; remove com.jboss.devstudio.integration-stack.soa.feature