SOAPUI Extension | Change of groupIds

- According to http://www.soapui.org/Test-Automation/maven-2x.html the groupId has been changed from eviware to com.smartbear.soapui and the artifactId from maven-soapui-plugin and maven-soapui-pro-plugin to soapui-maven-plugin and soapui-pro-maven-plugin

- It would also be great if the maven-soapui-extension-plugin could be supproted https://github.com/redfish4ktc/maven-soapui-extension-plugin/wiki
Merge pull request #24 from rompic/patch-2

SOAPUI Extension | Change of groupIds