Docs and functional tests: Rename files according to method name
Build: Fix style issues in Gruntfile
All: Update Local variables check for undefined

According to http://contribute.jquery.org/style-guide/js/#type-checks
Validation: Prefix all parameter validations with "parameter-"

Also rename E_OUT_OF_RANGE to E_PAR_OUT_OF_RANGE.
Validation: Style change only
README: Group errors by categories
Plural: Create .plural() and .formatPlural()

Borrow santhoshtr/CLDRPluralRuleParser.

Fixes #220
Closes #241
1.0.0-alpha.6