* Release versioning script with marker tags.
Introduces bump.sh which supports moving from version to version but
only within delimiting marker tags in the target file.
This script currently doesn't do validations or anything fancy.
* Allow bumping version according to type (major,minor,build,revision)
* bump.sh will display error if file contents are unchanged
* multi-module example for maven plugin master
* read byte source from classpath like swagger-parser does
* renamed schema to openapi.yaml for multi-module examples
* renamed schema to openapi.yaml for multi-module examples
