Improve temporaries naming.

This addresses some of the problems mentioned here https://github.com/EnterpriseQualityCoding/FizzBuzzEnterpriseEdition/issues/140
Now we just need to change the  package name com.seriouscompany.business.java.fizzbuzz.`packagenamingpackage`.impl.stringreturners;

to something more descriptive, since `packagenamingpackage` really isn't helpful.