Add binary_mode? private method to File.
Add binary_mode? private method to File.

anthonyryan1/fakefs,onehub/fakefs,pivotal-cf-experimental/fakefs,vhl/fakefs,1234-/fakefs,bquorning/fakefs,fakefs/fakefs,deployable/fakefs,marxarelli/fakefs,defunkt/fakefs,dekz/fakefs