create compatibility with QuantityComparable
rebase
Merge pull request #46 from otaviojava/refactor_comparable

Refactor ComparableQuantity
45: Consider a Measurement type for SE 

Task-Url:
https://github.com/unitsofmeasurement/uom-se/issues/issues/issue/45
remove unnecessary class
Merge pull request #47 from otaviojava/refactor_comparable

remove unnecessary class