Pyintervaltree

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- Fixed issue 5. This is the last version of this project.

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- Turns out, the tree was not balancing itself at all, as the corresponding code was wrong.

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- Support for Python 3
- Interval now inherits from a namedtuple. Benefits: should be faster.
Drawbacks: slight behavioural change (intervals not mutable anymore).

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- Slight changes for inclusion in PyPI.
- Some documentation changes
- Added tests
- Fixed the bug, where interval addition via [] would not work properly in Python 2.7
(see http://bugs.python.org/issue21785)
- Added intervaltree.bio subpackage, adding some utilities for use in bioinformatics

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- Forked from https://github.com/chaimleib/PyIntervalTree