paypro: account for PEM metadata as per rfc1424.
paypro: add a full PEM parsing function.
paypro: pem parsing - rename variables.
paypro: handle concatenated pems in pem parser.
root-certs: move function out of root certs file.
paypro: convert root certs to json.
root-certs: ensure JSON parses properly.
Merge pull request #508 from chjj/pem_fix

PEM parsing fix