Constants
BASE_URI = "http://www.unicode.org/Public/#{ActiveSupport::Multibyte::UNICODE_VERSION}/ucd/"
SOURCES = { :codepoints => BASE_URI + 'UnicodeData.txt', :composition_exclusion => BASE_URI + 'CompositionExclusions.txt', :grapheme_break_property => BASE_URI + 'auxiliary/GraphemeBreakProperty.txt', :cp1252 => 'http://unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP1252.TXT'