Added a spec which reveals an issue with filenames that contain non-7bit characters after the last dot.
Added a spec which reveals an issue with filenames that contain non-7bit characters after the last dot.

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