Mplgrid

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Fixes
- Fix the aspect argument as it was setting the aspect ratio, which produced the wrong size \
of chart when data was added.

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Fixes
- Fix docstrings for aspect (height / width)

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Changed
- removed the ability to create endnote and title axes.
- grid now returns axes and figure instead of a dictonary.
- grid uses matplotlib plt.subplots instead of manually adding the axes with fig.add_axes()
- aspect is flipped to match matplotlib (height / width) instead of the previous (width / height)
- arguments are now renamed: grid_height to height, grid_width to width, and max_grid to max_side.

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Changed
- renamed ax_key to grid_key and changed the default to 'grid'
- changed the defaults so there is no title or endnote
- changed the returned result so if there is no endnote or title \
it returns the axes (e.g. numpy array of axes) rather than a dictionary.

Added
- added a test for the figsize

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Initial version of mplgrid with functions for creating a grid of Matplotlib axes and calculating the
ideal grid dimensions.