using diamond
removes unucessary cast
Merge pull request #6 from otaviojava/diamond

using diamond
Merge pull request #7 from otaviojava/remove_cast

removes unnecessary cast
1: JIRA Placeholder 
Refactored converters
Task-Url:
https://github.com/unitsofmeasurement/unitsofmeasurement-parent/issues/issues/issue/1
2: Do we need AbstractMeasurement in RI? 

Task-Url: https://github.com/unitsofmeasurement/unit-ri/issues/issue/2
1: JIRA Placeholder 
Tagging
Task-Url:
https://github.com/unitsofmeasurement/unitsofmeasurement-parent/issues/issues/issue/1
5: Improve demos 

Task-Url:
https://github.com/unitsofmeasurement/unit-demos/issues/issue/5