Numdifftools

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pbrod (35):
* Got travis-ci working in order to run the tests automatically.
* Fixed bugs in Dea class.
* Fixed better error estimate for the Hessian.
* Fixed tests for python 2.6.
* Adding tests as subpackage.
* Restructerd folders of numdifftools.

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pbrod (5):
* Small cosmetic fixes.
* pep8 + some refactorings.
* Simplified code by refactoring.

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pbrod (20):
* Update and rename README.md to README.rst.
* Simplified call to Derivative: removed step_fix.
* Deleted unused code.
* Simplified and Refactored. Now possible to choose step_num=1.
* Changed default step_nom from max(abs(x0), 0.2) to max(log2(abs(x0)), 0.2).
* pep8ified code and made sure that all tests pass.

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pbrod (9):
* Updated the examples in Gradient class and in info.py.
* Added test for vec2mat and docstrings + cosmetic fixes.
* Refactored code into private methods.
* Fixed issue 7: Derivative(fun)(numpy.ones((10,5)) * 2) failed.
* Made print statements compatible with python 3.

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pbrod (1)
* Fixed a bug for inf and nan values.

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pbrod (1)
* Fixed a bug for inf and nan values.