Partial fix for Issue #35


Signed-off-by: Karel Goderis <karel.goderis@me.com> (github: kgoderis)
Fix for Issue #34


Signed-off-by: Karel Goderis <karel.goderis@me.com> (github: kgoderis)
Fix for Issue #30


Signed-off-by: Karel Goderis <karel.goderis@me.com> (github: kgoderis)
Merge branch 'sonosfix' of https://github.com/kgoderis/openhab2 into kgoderis-sonosfix
fixed issue #40

Signed-off-by: Kai Kreuzer <kai@openhab.org> (github: @kaikreuzer)
Fixed another NPE on newly added zone player

Signed-off-by: Kai Kreuzer <kai@openhab.org> (github: @kaikreuzer)
Merge branch 'kgoderis-sonosfix'

Signed-off-by: Kai Kreuzer <kai@openhab.org> (github: @kaikreuzer)