* Corrected ICV length for AES-GCM and AES-CCM in IPSec layer. Added unit tests to the ipsec campaign.
* Added travis support for pycrypto 2.7a1 combined modes.
* Updated documentation for pycrypto installation.
- update (part of) the documentation
- some URLs for Windows need to be updated
- update classifiers in setup.py
- remove `from __future__ import with_statement`
- use `{k: v for ...}` instead of `dict((k, v) for ...)`
- remove hacks for `gcd()` and `binrepr()` implementations
- use class decorators
- remove Python 2.6 Travis-CI tests