remove rxtx libray and reference to openhab library
add configuration for multiple meters
added converter for different item types
added new class doe meterdevice
Merge remote-tracking branch 'peter/master'

Conflicts:
	bundles/binding/org.openhab.binding.dmlsmeter/.classpath
	bundles/binding/org.openhab.binding.dmlsmeter/src/main/java/org/openhab/binding/dmlsmeter/internal/MeterDevice.java