Add a select box to the view for measurements.
Grab the measurement unit from the controller.

Display it in the backend.
Allow the setting of the measurement unit.

Ensure that if a measurement unit is present, that the value is numeric
as we'll need to perform mathematical functions on it in the future.
Use lowercase measurement unit names.
Display values according to their measurements.
Use nil instead of "none"
Group the display suffixes with the unit type.
Merge pull request #7 from freerunningtech/measurements

Add measurements.