Core: locale( [locale|cldr] )

Globalize.locale() now accepts either a locale String or a Cldr instance.

Ref #229
README: Amend rename translate on message

Revert commit 509d3278c0fdf1f5dff618a69d3c96e3b145ad2f and make the
change that should be previously made. There was some plural README updates
leak before.
Plural: Create initial module

Borrow santhoshtr/CLDRPluralRuleParser.

Ref #220