Merge pull request #21 from aroth-arsoft/master

fix for issue remote_user and realm #19
Convert remaining sprintf to snprintf
Use strlchr and strncmp where needed
update ChangeLog
Less specific versions in readme, add help section
Check return value of putenv
Test using gsskrb5_register_acceptor_identity
Correct all arguments and logic for keytabs

Must have been three-quarters asleep when I wrote
that code.  kt_env for the env variable, kt for the
gsskrb5 call.
Merge branch 'gsskrb5_register_acceptor_identity'

Closes #22
Hint at the origin of the bogus password
Merge pull request #24 from neirbowj/illuminated_bogus

Hint at the origin of the bogus password
Describe bogus auth header in readme

Closes #25
Add additional log and debug statements for bogus auth