Cidrize

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- Added real argument parsing using optparse.
- Added dump() function for use with verbose output display.
- main() can be imported as easy command-line interface to cidrize functionality.
- Added command-line tool 'cidr' as proof-of-concept for main().
- General cleanup.

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- cidrize() always returns a list upon successful parsing.
- CidrError exception raised on errors by default. (modular=True).
- Exceptions can be silenced and returned as a list of errors (modular=False).
- Added CidrizeError to __all__
- No longer importing * from netaddr/pyparsing.
- Added examples/ipaddr.py which I am using in a web app for strict validation.
- Improved docstrings.
- Implemented setup.py.

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- Initial release