turned off debugging
398467 Servlet 3.1 Non Blocking IO

ensure that EOF is checked after all calls to nextContent
398467 Servlet 3.1 Non Blocking IO

fixed lock issue detected by Threadsafe from contemplateltd.com
simplified HttpInput lock design
412940 minor threadsafe fixes
412940 minor threadsafe fixes
412940 minor threadsafe fixes

hold lock for accessing elements size
Merged branch 'jetty-9.1' into 'http_client_transport'.
Improved exception handling in HttpSender.
Proceeding only if expecting a 100-Continue response.