Csdmpy

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Changes
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- Image and Contour plots of csdm objects no longer draw colorbar. Colorbar can be
requested separately using `plt.colorbar()`.

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What's new!
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- Add ``size`` method to the CSDM object.
- Added alias for the csdm keywords that are short and easy for coding. The following is the list of aliases

- `dependent_variables` -> `y`
- `dimensions` -> `x`
- `add_dependent_variable` -> `add_x`
- `add_dimension` -> `add_x`
- `coordinates` -> `coords`

Bug fixes
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- Fixed bug causing a false error when reading sparse datasets.

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Bug fixes
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- Bugfix in fft method when applied to multi-dimensional CSDM objects.
- Added new tutorial examples.

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Bug fixes
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- Bugfix regarding the phase multiplier for the ``CSDM.fft()`` methods where an
incorrect phase was multiplied to the signal vector.

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What's new!
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- Support for ``matplotlib.pyplot`` functions from ``CSDM`` objects.
- ``plot``,
- ``scatter``,
- ``imshow``,
- ``contour``, and
- ``contourf``

Now you can directly plot CSDM objects as an argument to the above matplotlib
methods.

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Bug fixes
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- Fixed bug where the metadata from the ``csdm.application`` key was not serialized
to the file when using ``csdm.save()`` method.
- Fixed a bug where the transpose of a CSDM object failed to retain the quantity_type
information after the transpose.

Other changes
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- Add a new diffusion tensor MRI dataset to the example gallery.
- Added ``dict()`` as an alias to the ``to_dict()`` method for all objects.
- Added an alias of the ``cp.plot()`` function to the CSDM object as the
``plot()`` method.