Added script for evaluation of xcape speed

[xebadir]

Added a script for the paper that compares Metpy performance to xcape - at this stage I'm not sure its using Dask, so comparison may be a little slower.

[codecov]

Codecov Report

Merging #49 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
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  Coverage   66.78%   66.78%           
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  Files           9        9           
  Lines         283      283           
  Branches       74       74           
=======================================
  Hits          189      189           
  Misses         74       74           
  Partials       20       20           

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