extract method: addNewCapabilitiesElement(String)
- refactoring: reduce method length by extracting methods
- Each element of status, observedBBOX, and featuresOfInterest are added
as own <Capabilities> elements
removed done todo
Implemented observedBBOX for 'mobile' sensors
Set reference frame in observedBBOX
Use separate referenceFrame for observedBBOX; one for sensor/system
position and one for observedBBOX
Improved SensorDescription Builder

- set validTime with TimeInstant and TimePeriod incl. indeterminate values
- set collecting status independ from other capabilities
Merge pull request #20 from EHJ-52n/develop

Updates