5: Improve demos 

Task-Url:
https://github.com/unitsofmeasurement/unit-demos/issues/issue/5
Merge branch 'master' of
https://github.com/unitsofmeasurement/unit-api.git
5: Improve demos 

Task-Url:
https://github.com/unitsofmeasurement/unit-demos/issues/issue/5
UNITSOFMEASUREMENT-57: Latest Java 7 and 8 compilers break ME 8
compatibility 

Task-Url: https://java.net/jira/browse/UNITSOFMEASUREMENT-57