Update to latest browserid-crypto.

The latest browserid-crypto removed support for "new format"
certificates and assertions, which required some slight tweaks to the
tests.

We *could* keep the "RSA"/"DSA" compatability hooks for algorithm name as part of browserid-crypto, which would make this PR just a version bump.  But IIUC they were never used in the wild, so it seems prudent to be strict and catch potential incompatibilities early.

@fmarier r? in combination with https://github.com/mozilla/browserid-crypto/pull/103