410893 async support defaults to false for spec created servlets and filters
Merge remote-tracking branch 'origin/jetty-8'

Conflicts:
	jetty-servlet/src/main/java/org/eclipse/jetty/servlet/FilterHolder.java
	jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHandler.java
410893 async support defaults to false for spec created servlets and filters
410893 async support defaults to false for spec created servlets and filters

fixed up continuations for differen isAsyncStarted behaviour