Pybrowserid

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* Remove ability to use a custom JWT parser class, it's not used and
adds needless complexity.
* Add a way to skip the ssl verification when getting certificates with the
CertificateManager.

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* add support of requests rather than custom code for ssl checking when
retrieving certificates.
* removed patch utility for secure_urlopen (we are now using requests)
* add more verbose errors when dealing with RSA/DSA Keys.

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* Renamed from PyVEP to PyBrowserID, in keeping with Mozilla branding.
* Audience checking now accepts glob-style patterns as well as fixed
audience strings.
* Verifier objects now accept a list of audience patterns as their first
argument. This is designed to encourage doing the right thing rather than,
say, passing in the hostname from the request.
* Allowed LocalVerifier to use of a custom JWT parser.
* Removed browserid.verify_[remote|local|dummy] since they just cause
confusion. You should either accept the defaults provided by the
browserid.verify function, or use a full-blown Verifier object.
* Split certificate loading and caching into a separate class, in
browserid.certificates:CertificatesManager.
* Removed the DummyVerifier class in favour of supporting functions
in browserid.tests.support.