release first version v0.1
iterate development version
updated build environment
updated build environment
updated documentations
new XSD schemas migrated

XSD-schemas from the current production environment at http://rest.immobilienscout24.de/restapi/api/offer/v1.0/?_wadl&_schema were imported. The new XML classes were generated with JAXB.
add default CONTRIBUTING.md
README.md updated
prepare version 0.1.1
release version 0.1.1