Change bug reporting information from Bugzilla  to GitHub issues
New feature when requesting observations with multiple temporal filter:
- temporal filter with the same valueReference will be disjunct
- temporal filter with different valueReferences will be conjunct.
Fix erroneous TimeInstant constructor for Date and add test case:
- the local value was checked instead of the parameter
Add decoder key for SWES namespace.
Add GetDataAvailability SOAP action uris
Add support for TemporalOpDocument
Add several constants:
- element names
- QNames
Add method to get XPath prefix for prefix and namespace
Add getter for extension set
Add setting for optional observation count in GetDataAvailability response to show or not
Add temporal filter with valueReference resultTime to example requests
- Update GetDataAvailability to current XML schema: http://waterml2.org/schemas/gda/1.0/gda.xsd
  - old implemented version is still supported
- Add valid resultTimes to response:
  - for each timeseries
  - encoded as swe:DataRecord in gda:extension
  - resultTimes can be restricted by temporal filter:
    - in swes:extension of the request
    - encoded as fes:TemporalOps, e.g fes:During with gml:TimePeriod and phenomenonTime as valueReference
Merge pull request #46 from CarstenHollmann/feature/gda-resultTime-getObs-temporalFilterConjunction

Adapt GetDataAvailability to schema and add GetObservation temporal filter conjunction for different valueReferences