Maxminddb

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* Corrected initialization of objects in C extension and made the objects
behave more similarly to their pure Python counterparts.

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* Switched to Apache 2.0 license.
* We now open the database file in read-only mode.
* Minor code clean-up.

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* Fixed packaging problem that caused ``import`` to fail.

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* This release includes a pure Python implementation of the database reader.
If ``libmaxminddb`` is not available or there are compilation issues, the
module will fall-back to the pure Python implementation.
* Minor changes were made to the exceptions of the C extension make them
consistent with the pure Python implementation.

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* Removed -Werror compiler flag as it was causing problems for some OS X
users.

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* Refactored code and fixed a memory leak when throwing an exception.