12: Find workaround for SE 8 type inference problems or stick to SE 7 

Task-Url:
https://github.com/unitsofmeasurement/unit-impl-se/issues/issues/issue/12
1: JIRA Placeholder 
Updated API
Task-Url:
https://github.com/unitsofmeasurement/unitsofmeasurement-parent/issues/issues/issue/1
Updated JavaDoc