Initial commit of Wemo Binding for openHAB 1.x

This is a new implementation of a binding for Belkin's Wemo-Switch.
Information on how to setup the binding can be found in the included readme.md (prepared WIKI page).

Please feel free to comment !

Regards
Hans-Jörg
please rename this method to sendCommand since setOn could be misleading. I would also suggest to change the type of the onOff Parameter to Command. If that case there is only one place responsible for "translating" commands.