Pykrige

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*February 15, 2015*

* Fixed a problem with the tests that are performed to see if the kriging system is to be solved at a data point. (Tests are completed in order to determine whether to force the kriging solution to converge to the true data value.)
* Changed setup script.

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*January 25, 2015*

* Changed license to New BSD.
* Added support for point-specific and masked-grid kriging. Note that the arguments for the `OrdinaryKriging.execute()` and `UniversalKriging.execute()` methods have changed.
* Changed semivariogram binning procedure.
* Boosted execution speed by almost an order of magnitude.
* Fixed some problems with the external drift capabilities.
* Added more comprehensive testing script.
* Fixed slight problem with `read_asc_grid()` function in `kriging_tools`. Also made some code improvements to both the `write_asc_grid()` and `read_asc_grid()` functions in `kriging_tools`.

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*November 23, 2014*

* Consolidated backbone functions into a single module in order to reduce redundancy in the code. `OrdinaryKriging` and `UniversalKriging` classes now import and call the `core` module for the standard functions.
* Fixed a few glaring mistakes in the code.
* Added more documentation.

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*October 27, 2014*

* First complete release.