FLUME-2181 - Optionally disable File Channel fsyncs (Hari via Brock)
FLUME-2381: Upgrade Hadoop version in Hadoop 2 profile to 2.4.0

(Hari Shreedharan via Jarek Jarcec Cecho)
FLUME-2368. Update CHANGELOG for 1.5 release
Merge branch 'apache-flume-1.5' into flume-1.5