Bundler generated ruby gem

Moved a few bits to make it more to my liking
Hardcode the version number

Start at version 0
Import Test::Unit extension

From "Ruby Best Practices"
https://github.com/sandal/rbp/blob/master/testing/
Initial tests
First attempt at the code

This passes most of the tests. It doesn't patch literals properly (eg.
3 * 3.meters doesn't work) and the Units constructor needs a little
love. But, for the most part, it's functional.
Fix the Units initializer

Now it accepts arrays of units
Allow both plural and singular units

For example, 'meters' and 'meter' are considered the same unit
Add support for SI prefixes
Add SI and US Customary units

According to Wikipedia
Fixed units parsing

Wasn't properly handling prefixes
Added inspect methods to LiteralWithUnits and Units
Added a test to check equality with differing prefixes

1 meter should be equal to 100 centimeters
Added initial support for abbreviations
Allow addition and subtraction of literals

This probably isn't mathematically correct, but it produces more intuitive behavior.
Moved UnitsMixin to its own file
Added an inspect method to UnitsMixin
Added to_s methods
Renamed LiteralWithUnits to Units::Literal

Moved it to it's own file and gave it a test suite
Version 1
Use alias_method in Units

Instead of wrapping inspect