fixed Java 8 generics issue
LinkedSets to maintain order
enable Java 8 on Travis
Remove override annotation
Merge branch 'develop' into fix/java8-compability

* develop:
  fixed OGC logo URL in footer
  speed up build by fetching SCM revision only once
  Fix duplicate column definition.
  removed repository declaration in sub-pom
override XPathFactory implementation for SAXON

see https://saxonica.plan.io/issues/1944
Merge pull request #29 from autermann/fix/java8-compability

Oracle JDK 8 compatibility
Remove version: it is already managed
Fix wrong version of do extension and rest binding
Update to latest version
Update xmlbeans-xpath version to 2.6.0, same as for xmlbeans dependency
Update NOTICE file after changing the SOS-Test-Suite license
Fix incorrect list splitting for the limit expression depth
allow endpoint style binding definitions in client config