Added a "Gotchas" section to the readme highlighting possible problem attributes in blueprints and how to work around them.
Added a "Gotchas" section to the readme highlighting possible problem attributes in blueprints and how to work around them.

dominicsayers/machinist,dominicsayers/machinist,leereilly/machinist,notahat/machinist,amiel/machinist,ianwhite/machinist,emmanuel/machinist,rubyhead/machinist,rubyhead/machinist