allow _metadata_pathname to be called as a class method with type as arg
chdir back to original cwd before calling pod2usage
improve error handling arround missing/invalid conf-dir command-line arg
refactor metadata builder to generate SP config for assertion service too
don't indent text content of X509Certificate element in SP metadata

The SP metadata import function on the RealMe IdP is apparently sensitive
to leading whitespace in Base64-encoded data.  XML::Generator's preety-
print function seems to be an all-or-nothing option so this patch uses a
horrible hack with a reegex to un-indent specific element content.
update 'make-bundle' to create .zip files for assertion and/or login