Dynamicisttoolkit

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- Made the numerical derivative function more robust and featureful. [PR
`27`_]
- ``butterworth`` now uses a corrected cutoff frequency to adjust for the
double filtering. [PR `28`_]

.. _27: https://github.com/moorepants/DynamicistToolKit/pull/27
.. _28: https://github.com/moorepants/DynamicistToolKit/pull/28

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- Fixed bug in coefficient_of_determination. [PR `23`_]

.. _23: https://github.com/moorepants/DynamicistToolKit/pull/23

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- Fixed bug in normalized cutoff frequency calculation. [PR `21`_]

.. _21: https://github.com/moorepants/DynamicistToolKit/pull/21

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- Fixed bug in butterworth function and added tests.

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- Fixed butterworth to work with SciPy 0.9.0. [PR `18`_]

.. _18: https://github.com/moorepants/DynamicistToolKit/pull/18

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- Removed pandas dependency.
- Improved time vector function.
- Removed gait analysis code (walk.py), now at
http://github.com/csu-hmc/Gait-Analysis-Toolkit.
- TravisCI tests now run, added image to readme.
- Added documentation at ReadTheDocs.