Python-gnutls

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* Removed unnecessary code
* Fixed blocking client example
* Updated TLS certificates
* Fixed X509Credentials for client examples
* Simplified and made MANIFEST.in more explicit
* Explicitly use python2 in shebang lines
* Preserve quoted arguments when passing them along in shell scripts
* Updated copyright years
* Updated license

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* Fixed truncated data for DER exported certificates/keys
* Removed obsolete pycompat/pyversions files

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* Add ability to set the client certificate request option for servers

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* Fixed check for OpenPGP support
* Don't force the reactor type in test scripts
* Support GnuTLS 3.4
* Refactor passing parameters to Session objects
* Added __info__ module with package details
* Minor improvements to the Debian packaging
* Updated installation instructions
* Fix tests with latest python-application

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* Initialize default cipher priorities on Session

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* Swtich to GnuTLS 3 (>= 3.1.4)
* Added gnutls_certificate_verify_peers3
* Add dependency on libgnutls
* Remove no longer needed workaround for ctypes
* Avoid sending empty data to peer
* Add count command line option to tc-openssl
* Bumped Debian Standards-Version
* Only build Debian package for Python >= 2.7