add falsiness for 'false', lowercase
Merge branch 'master' of github.com:smartt/sanity

* 'master' of github.com:smartt/sanity:
  adds numerical representations of fancy quotes to simplify_entities
  adds test for None and sorts Rhode Island better
  adds a couple odd abbreviations
  adds an XSS test that django's strip_tags was failing on
  two-way US state-to-abbreviation conversion
  price_like casts to string first)
  adds a scrub_sql function
  more asciification character mappings
  more sad attempts at representing characters in ASCII
  html_to_ascii replaces ansi_num entries too
  adding ascii_replace for more chars
  makes it possible to skip named entities in simplify_entities
  allows passing a skip_list through html_to_ascii
  nuking newlines before cleaning_html
  replacing newlines before nuking control chars
  cast.to_ascii accepts a replacement char now
  adding html_to_ascii
  adding lots more chars and codes