Fixes/Improves various elements of the TCP and UDP bindings
 - Fix issue #478
 - Make listener port start-up = f(.cfg)
 - Better integration for "extending" classes
 - Typo's
Merge pull request #20 from sumnerboy12/master

Added retry logic to PiFace binding
Merge pull request #18 from kgoderis/tcppatch

Fixes/Improves various elements of the TCP and UDP bindings
Merge branch 'master' of https://github.com/openhab/openhab