first version of REST API based on OSGi JAX-RS connector

Signed-off-by: Kai Kreuzer <kai@openhab.org>
adapted resources to be proper OSGi services and produce nice JSON

Signed-off-by: Kai Kreuzer <kai@openhab.org>
fixed small bugs

Signed-off-by: Kai Kreuzer <kai@openhab.org>
Merge pull request #98 from kaikreuzer/osgi-jaxrs

Changed REST API to use OSGi JAX-RS Connector and removed XML support