UNITSOFMEASUREMENT-70: Add five methods in Quantity interface 
compareTo() on impl classes should be sufficient for this it seems
Task-Url: https://java.net/jira/browse/UNITSOFMEASUREMENT-70
UNITSOFMEASUREMENT-69: Rethink hierarchy (and possibly naming) of
Quantity and Measurement 

Task-Url: https://java.net/jira/browse/UNITSOFMEASUREMENT-69
UNITSOFMEASUREMENT-69: Rethink hierarchy (and possibly naming) of
Quantity and Measurement 

Task-Url: https://java.net/jira/browse/UNITSOFMEASUREMENT-69
add integration with TimeUnit
add methods utils to Time
Merge pull request #42 from otaviojava/time_integration

Time integration
Add five methods in Quantity interface