Upgrade to apache common-net 2.2

The Apache Commons::Net team are pleased to announce the release of Commons::Net version 2.2.
This is primarily a maintenance release but it also includes some new features and enhancements.
Users of version 2.0 are encouraged to upgrade to 2.2 as this release includes some important bug fixes.
A summary of the changes is available here:
http://commons.apache.org/net/changes-report.html#a2.2
Binaries and source jars are available from the usual download locations