Update JavaDoc
UNITSOFMEASUREMENT-59: Remove "generic" multiply/divide operations from
Quantity 
Adjusted JavaDoc (not removing anything yet;-)
Task-Url: https://java.net/jira/browse/UNITSOFMEASUREMENT-59
UNITSOFMEASUREMENT-59: Remove "generic" multiply/divide operations from
Quantity? 
Adjust test classes
Task-Url: https://java.net/jira/browse/UNITSOFMEASUREMENT-59