* bsdi_crypt apparently available on openbsd 4.9
* typo fixes
* ConfigParser apparently only uses OrderedDict for >= PY27,
  adjusted CryptContext test accordingly
* fixed test that depended on sha256_crypt.default_rounds
* handle os_crypt backend w/ no fallback (bcrypt)
* let _norm_rounds accept longs

* cleaned up source of des_crypt variants and DES util functions
* DES utils functions now have tighter input validation, full UT coverage

* test os_crypt backend has functional fallback
* test handler methods accept all unicode/bytes combinations for secret & hash
* fixed some incorrect error messages & types being caught & raised
* other minor cleanups

* adds hack to disable saslprep() since stringprep is missing

* passing a non-string secret or non-string hash to any
  CryptContext or handler method will now reliably result
  in a TypeError.

  previously, passing hash=None to many handler identify() and verify()
  methods would return False, while others would raise a TypeError.
  other handler methods would alternately throw ValueError or TypeError
  when passed a value that wasn't unicode or bytes.
  the various CryptContext methods also behaved inconsistently,
  depending on the behavior of the underlying handler.

  all of these behaviors are gone, they should all raise the same TypeError.

* redid many of the from_string() methods to verify the hash type.

* moved secret type & size validation to GenericHandler's encrypt/genhash/verify methods.
  this cheaply made the secret validation global to all hashes, and lets
  _calc_digest() implementations trust that the secret is valid.

* updated the CryptContext and handler unittests to verify the above behavior is adhered to.