Update XML common version to 2.0.0:
- Changed license (Apache License, version 2.0)
- Requires Sampling v2.0 decoder changes:
  - sampledFeature multiplicity changed from 1..1 to 1..*
Add support for transactional feature relation (sampledFeature)
Remove duplicate casting
- Add HREF enum to HelperValues
- Used in GML 3.2.1 encoder return a featurePropertyType with xlink:href instead of an encoded feature, e.g. used to encode sampledFeature in SpatialSamplingFeature
Add version for maven-source-plugin
Merge pull request #122 from shane-axiom/add-maven-source-plugin-version

Add version for maven-source-plugin
Use doubles instead of BigDeciamls for numeric obs values (#120)
Merge pull request #123 from shane-axiom/use-double-for-numeric-obs-value

Use doubles instead of BigDecimals for numeric obs values (#120)
Merge branch 'develop' into feature/transactional_feature_relation
Merge pull request #124 from CarstenHollmann/feature/use_xml_common_200

Update XML common version to 2.0.0:
Merge branch 'develop' into feature/transactional_feature_relation
Merge pull request #125 from CarstenHollmann/feature/transactional_feature_relation

Add support for transactional feature relation
Add license header
fix for 'cannot access javax.servlet.ServletContextListener'

either introduced by the update of jdk (8u11 -> 8u20) or maven (3.2.2 -> 3.2.3)

Conflicts:
	hibernate/feature/pom.xml
Merge pull request #126 from autermann/fix/context-listener-not-found

Fix for 'cannot access javax.servlet.ServletContextListener'
Merge remote-tracking branch 'upstream/develop' into develop

* upstream/develop:
  fix for 'cannot access javax.servlet.ServletContextListener'
  Add license header
  Use doubles instead of BigDeciamls for numeric obs values (#120)
  Add version for maven-source-plugin
  - Add HREF enum to HelperValues - Used in GML 3.2.1 encoder return a featurePropertyType with xlink:href instead of an encoded feature, e.g. used to encode sampledFeature in SpatialSamplingFeature
  Remove duplicate casting
  Add support for transactional feature relation (sampledFeature)
  Update XML common version to 2.0.0: - Changed license (Apache License, version 2.0) - Requires Sampling v2.0 decoder changes:   - sampledFeature multiplicity changed from 1..1 to 1..*
Check if the execution of the samplingGeometry extent query should be executed (improve performance):
- Add pre-query to check if the observation table contains not null samplingGeometries.
- If only samplingGeometries with null value are contained, the extent query is not executed during the offering cache update.
Merge pull request #128 from CarstenHollmann/fix/check_if_samplingGeometry_not_null

Check if the execution of the samplingGeometry extent query should be executed
removed mandatory schema setting for datasources

(fixes #127)
Extract ProcedureTimeExtrema to separate class