Require inputs in Imperial units

[nabeelio]

• Length: miles (distances)
• Volume: gallons (fuel)
• Mass: lbs

Conversion Library: https://github.com/PhpUnitsOfMeasure/php-units-of-measure

Tasks

• Create accessors for distance and other units for DB tables
• Resources return:

{
  "distance": {
    "mi": 1,
    "m": 1609.34,
    "nm":  0.868976
}