[ENGOPS-735] Fix publish issues

Set ivy.artifact.group=pentaho in build.properties 
Added zip publication in ivy.xml 

"Because this is undefined, the sources jar and the ivy.xml are publishing to groupID=mycompanyname. Somehow the zip and class files jar are publishing to groupID=pentaho. Since there is no ivy file for the assembly zip, we are probably seeing issues with stale artifacts. 
There was no zip in ivy publications. This should be added too."