0.2 (2011/06/23)
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* Made the upper end of the range optional
* Fixed a bug in the Range model clean method if upper is null

0.1 (2011/06/17)
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* IPAddressFormField for inputting IP Addresses
* IPAddressModelField for storing IP addresses as integers (so math works)
* Range Model for storing IP Ranges tied to a user account
* Range Authentication backend
* A login view wrapper that attempts to login via IP first
