Allo parsing of localized Quantities.

This extends the Unlocalizer interface to provide regular expressions
for numbers and units. It also cleans up the Localizer and Unlocalizer
interfaces, and provides basic implementations and tests.

DEPLOYMENT: Bumps version to 0.3 due to BREAKING CHANGES to the
Localizer and Unlocalizer interfaces.
specify regex delimiter when callign unlocalizer
Merge pull request #2 from DataValues/ParseLocalizedQuantities

Allo parsing of localized Quantities.