paypro: fix root certs.
paypro: verify the certificate chain.
paypro: use fedor's asn1.js to deal with DER certificates.
paypro: asn1.js - cleanup.
paypro: verify chain refactor.
paypro: use asn1.js in browser paypro.
paypro: fix root cert check.
paypro: fix chain validation for browser.
paypro: asn1.js debugging - try to get tbs buffer.
Revert "paypro: asn1.js debugging - try to get tbs buffer."

This reverts commit 3c7aeb4f62c27305294f95eb8875b370b2407227.
paypro: more debugging.
Revert "paypro: more debugging."

This reverts commit b406eeadffe65d7bdf292abd3bb48d3e42cfa7ec.
paypro: fix browser kjur usage.
paypro: attempted debugging with KJUR.
Revert "paypro: attempted debugging with KJUR."

This reverts commit 5788fdbb52a42e8e4a1841f5d67af9afef5e3082.
paypro: debugging and sigAlg/pubKey formats.
paypro: remove debug code.
paypro: start using asn1.js v0.4.1.
paypro: check issuer. ignore fixed asn1.js bug.
paypro: start handling certificate extensions.