Asn1crypto

- Fixed a `unicode`/`bytes` bug with `x509.URI.dump()` on Python 2

- Backwards Compatibility Break: `core.NoValue` was renamed to `core.Void` and
a singleton was added as `core.VOID`
- 20-30% improvement in parsing performance
- `core.Void` now implements `__nonzero__`
- `core.Asn1Value.copy()` now performs a deep copy
- All `core` value classes are now compatible with the `copy` module
- `core.SequenceOf` and `core.SetOf` now implement `__contains__`
- Added `x509.Name.__len__()`
- Fixed a bug where `core.Choice.validate()` would not properly account for
explicit tagging
- `core.Choice.load()` now properly passes itself as the spec when parsing
- `x509.Certificate.crl_distribution_points` no longer throws an exception if
the `DistributionPoint` does not have a value for the `distribution_point`
field

- Corrected `core.UTCTime` to interpret year <= 49 as 20xx and >= 50 as 19xx
- `keys.PublicKeyInfo.hash_algo` can now handle DSA keys without parameters
- Added `crl.CertificateList.sha256` and `crl.CertificateList.sha1`
- Fixed `x509.Name.build()` to properly encode `country_name`, `serial_number`
and `dn_qualifier` as `core.PrintableString` as specified in RFC 5280,
instead of `core.UTF8String`

- Added Python 2.6 support
- Added ability to compare primitive type objects
- Implemented proper support for internationalized domains, URLs and email
addresses in `x509.Certificate`
- Comparing `x509.Name` and `x509.GeneralName` objects adheres to RFC 5280
- `x509.Certificate.self_signed` and `x509.Certificate.self_issued` no longer
require that certificate is for a CA
- Fixed `x509.Certificate.valid_domains` to adhere to RFC 6125
- Added `x509.Certificate.is_valid_domain_ip()`
- Added `x509.Certificate.sha1` and `x509.Certificate.sha256`
- Exposed `util.inet_ntop()` and `util.inet_pton()` for IP address encoding
- Improved exception messages for improper types to include type's module name

- Fixed bug in `core.Sequence` affecting Python 2.7 and pypy

- Added PEM encoding/decoding functionality
- `core.BitString` now uses item access instead of attributes for named bit
access
- `core.BitString.native` now uses a `set` of unicode strings when `_map` is
present
- Removed `core.Asn1Value.pprint()` method
- Added `core.ParsableOctetString` class
- Added `core.ParsableOctetBitString` class
- Added `core.Asn1Value.copy()` method
- Added `core.Asn1Value.debug()` method
- Added `core.SequenceOf.append()` method
- Added `core.Sequence.spec()` and `core.SequenceOf.spec()` methods
- Added correct IP address parsing to `x509.GeneralName`
- `x509.Name` and `x509.GeneralName` are now compared according to rules in
RFC 5280
- Added convenience attributes to:
- `algos.SignedDigestAlgorithm`
- `crl.CertificateList`
- `crl.RevokedCertificate`
- `keys.PublicKeyInfo`
- `ocsp.OCSPRequest`
- `ocsp.Request`
- `ocsp.OCSPResponse`
- `ocsp.SingleResponse`
- `x509.Certificate`
- `x509.Name`
- Added `asn1crypto.util` module with the following items:
- `int_to_bytes()`
- `int_from_bytes()`
- `timezone.utc`
- Added `setup.py clean` command