Add Latin Extended-A Unicode decompositions to remove_accents()

[ryan]

Add decompositions for the Latin Extended-A Unicode block to
remove_accents(). See the decompositions for Latin-1 Supplement for an example. For each character in Latin Extended-A that has an unaccented Basic Latin character in its canonical decompostion, map the UTF-8 octets for that character to the Basic Latin character. Reference the UCD or employ a character map utility to get the canonical decomposition.

[ryan]

​http://trac.wordpress.org/changeset/2484