Bugs:
  If an @imported document is changed, Sass should recompile the template
  warn should be defined locally in case of no ActionPack
  == #{"Foo"} doesn't work in Haml
  "&.foo, bar" in Sass should read as "&.foo, & bar"

Testing:
  Test html2haml and css2sass

Documentation:
  Haml::Engine public method documentation could use work

Features:
  Sass should throw generic errors for undefined constants, not syntax errors
  Sass::Plugin should log errors
  There should be a way to represent options in-document
  There should be a way to make Haml tags not insert whitespace
  "%li, %a"?
  Sass::Engine load_paths option should be set by executable
  Unary minus in SassScript
  Deprecated uses of ~ should be removed
  Get rid of line number counting and make template lines one-to-one with precompiled lines