created quantity_matchers.
Quantity<D>::SIUnit().
Fix some linter errors.
Wrote some sort of matcher.
Merge branch 'master' into matchers
things.
test_utilities -> testing_utilities, first attempt at a matcher.
Matcher seems to work.
Approximations.
More matchers.
Print Quantity and Dimensionless correctly.
Factor and cleanup.
Also test dimensionful things, make them work.
Explicit matcher classes, spec.
Started writing body, lint.
Linting, implementation, some renaming due to the way polymorphic matchers will have to work.
Implement bits of almost_equals, spec makes sense.
Implemented ULP distance, Value -> value, other things.
Now I need to implement some shit.
almost_vanishes_before spec, numerics.