Python-tamer

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* Added the new ``ExposureMapSequence`` class providing much improved map making capabilities (this was the majority of the work)
* Added the ``render_map()`` function to produce more beautiful maps across in a more versatile way
* Added the ``str2daysofyear()`` function to interpret keywords like month names and produce the days of the year
* Added the ``analyse_variable()`` function to the ``SpecificDoses`` class for more flexible analysis options

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* Fixed errors in example code in documentation
* Fixed ``ER_Vernez_2015()`` function
* Updated assumptions about units to reflect new dataset from Vuilleumier in UVI rather than W m-2
* Fixed issue where modifying ``map_options`` property would result in it being set to None

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* Compiled and added to PyPI for easy public access
* Added standalone function for calculating ER using the Vernez 2015 method: ``ER_Vernez_2015()``
* Significantly expanded and standardised docstrings, adding examples
* Fixed error involving day selection in ``SpecificDoses`` class being one day late
* Added ``SpecificDoses.standard_column_names()`` function for standardising column names to ensure functionality

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* Added documentation
* Added basic unit tests for each class (``SpecificDoses`` and ``ExposureMap``)
* Added histogram descriptor calculator functions to subroutines.
* Added map making functionality for ``ExposureMap`` class, limited consideration of ``map_options`` at this stage
* Fixed errors when working with single day test data (but anticipate further issues with this, to be fixed in a later release)

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* Alpha release on github only, no documentation and limited functionality