remove the version string from EE7 EJB JAR file name

The EE5 and EE6 EJB JARs don't have the version string in their file names
and it's a convention we tend to like. Let's make the EE7 EJB JAR consistent.
Merge pull request #19 from Ladicek/ee7-ejb-jar-without-version

remove the version string from EE7 EJB JAR file name