minor fix
if a ClientFuture has handler (which means a listener) we always resend
null set values are removed in multiple backup operations
Hosted MC doc improvements
used factory class for instance creation
Merge pull request #1931 from gurbuzali/minor-failed-listener-fix/3.2-RC2

minor fix
Merge pull request #1932 from mesutcelik/fix/3.x/1854

null set values are removed in multiple backup operations
ClientTestApp added to examples
client.sh added
Hosted MC Doc Improvements