Don't raise ImportError, if the constant GSS_C_DELEG_POLICY_FLAG is not defined.
MIT kerberos prior to version 5.1.7 does not define this constant.
It's better to use sys.executable instead of hardcoded text "python" in case you want to use a non default python interpreter like python2.7.
Merge remote-tracking branch 'SebastianDeiss/setup_fix'

Merges pull request #3

Conflicts:
	setup.py
Merge pull request #2 from SebastianDeiss/old_MIT_fix

Don't raise ImportError, if the constant GSS_C_DELEG_POLICY_FLAG is not defined.
Document C_DELEG_POLICY_FLAG behaviour.

The flag is missing from MIT Kerberos 5 versions before Release 1.7 and
so will not be present in the generated gssapi.headers.gssapi_h module
or the gssapi module.
Generate a list of contributors from Git.
Bump version to 0.4.1