add specs for UTF-16 and UTF-32.
add specs for UTF-16 and UTF-32.

schepedw/mail,kjg/mail,jonkgrimes/mail,jeremy/mail,wktk/mail,schneems/mail,planio-gmbh/mail,zacholauson/mail,schepedw/mail,missive/mail,kert-io/mail,carsonreinke/mail,carsonreinke/mail,smallspark/mail,yujinakayama/mail,pushrax/mail,kert-io/mail,0x00evil/mail,agaridata/mail,EdwardPantoja/mail,EdwardPantoja/mail,jeremy/mail,benmmurphy/mail,kainlite/mail,schneems/mail,kjg/mail,jonkgrimes/mail,benmmurphy/mail,pascalbetz/mail,smallspark/mail,kaineer/mail,mikel/mail,kaineer/mail,jeremyevans/mail,jeremyevans/mail,0x00evil/mail,agaridata/mail,pushrax/mail,wktk/mail,owenr/mail,pjskennedy/mail,pjskennedy/mail,Schniz/mail,zacholauson/mail