Intbitset

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Bug fixes
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- Fixes implementation of `del x[123]` operator which was wrongly
defined as `__del__` rather than `__delitem__`. (40)
- Amends license reST reference from gpl to lgpl to avoid detection
as GPL when scanning the docs for licensing information.

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Bug fixes
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- Reorganizes MANIFEST.in and adds missing files. (28) (29)

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* Removes coverage because it is not really supported for Cython modules.
* Automatically generates intbitset documentation by using Sphinx automodule
functionality.
* Overall, amends documentation to be compatible with reStructuredText.
* Amends .update() and corresponding methods to accept also non-intbitset
objects, such as lists or sets of integers respecting the set interface.
* Raises TypeError rather than terminating current process with a segmentation
fault when None is used on the left side of an operation with an intbitset.
* Initial release of Docker configuration suitable for local developments.
* No longer returns self in fastload().
* Stops using `-march=native` for compilation, because it makes the compiler
to optimize the code for only the currently used processor.

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* PyBytes_FromStringAndSize() fix in Python 2

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* Adds type checking for &, \|, etc. operators. The type of "self" was not
checked.
* Adds support for new union() and isdisjoint() set methods.
* Updates intbitset interface to look like set built-in in Python 2.6.
* Supports initialization of an intbitset from a set.
* No crash when intbitset is on rhs.
* Complete Python 3.x support.

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* Packaged into a standalone git repository.