* Mustache template should use invokerPackage tag to generate import
* upgrade to http signature library version 1.4
* Use updated HTTP signature library
* Run sample scripts
* Add code samples in README file for HTTP signature
* fix java imports
* Update http-signature version
* 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