Merge remote-tracking branch 'origin/jetty-8'

Conflicts:
	jetty-client/src/main/java/org/eclipse/jetty/client/HttpExchange.java
	jetty-client/src/test/java/org/eclipse/jetty/client/IdleTimeoutTest.java
	jetty-http/src/main/java/org/eclipse/jetty/http/HttpGenerator.java