Merge pull request #10 from stfnsche/master

[OPENENGSB-3761] handle correctly null values
[OPENENGSB-3776] xlink unit test
update oesb-root and oesb-framework versions
updated CHANGELOG and NOTICE files for the 1.1.0 release
[maven-release-plugin] prepare release v1.1.0
[maven-release-plugin] prepare for next development iteration