Improve naming in UnitConversionGraphTest.
Implement bona fine composite pattern.
Move to Java 8 and remove Lombok.
Change UnitMultiplier to Conversion.
Remove need of inverting conversion returned from graph.
Use function composition rather than application in UnitConversion.
Defer function application until conversion in Measurement.
Enable adding edge without inverse in UnitConversionGraph.
Add Celsius and Fahrenheit conversion.