accept a Buffer to hash
allow direct return of hash if just a buffer
s/out.close/out.end/ for 0.8 compat
Merge branch 'master' of https://github.com/rvagg/hash_file

* 'master' of https://github.com/rvagg/hash_file:
  s/out.close/out.end/ for 0.8 compat
  allow direct return of hash if just a buffer
  accept a Buffer to hash

Conflicts:
	.travis.yml
	test/test.js