Fauxfactory

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- Updated the `gen_mac` method to allow the generation of
unicast/multicast and globally/locally MAC addresses.

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- Updated the `gen_ipaddr` method to allow the generation of IP
addresses that start with a valid range prefix. (048715d, mfalesni)

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- Added support for **Python 2.6**.
- Cleaned up the MANIFEST file.

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- Improved the unicode letters generator to avoid returning control
characters and other non-letter characters.

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- Altered `gen_integer` to properly check for long() on Python 2.

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- Dropped the class-wide FauxFactory deprecation warning.
- Refactored the `deprecated` decorator function to comply with pylint
and flake8.
- Make gen_netmask verify function arguments.
- Make `gen_netmask` raise a `ValueError` if `min_cidr` is less than
0 or `max_cidr` is greater than 32. Add tests for this boundary
checking code.
- Improvements to constants and documentation.