Add CI

[govindchari]

Resolves Issue #15

Added CI and codecoverage.

Added error handling for plotting in unit tests.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@7c20950). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head 0b5e599 differs from pull request most recent head f892ee4. Consider uploading reports for the commit f892ee4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #16   +/-   ##
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  Coverage          ?   62.40%           
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  Files             ?       35           
  Lines             ?     4543           
  Branches          ?        0           
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  Hits              ?     2835           
  Misses            ?     1708           
  Partials          ?        0           

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[BenChung]

The way that python errors is handled right now is in my opinion really suboptimal. We should pretty-print the underlying error with a explanatory message leading and following it rather than just swallowing the exception, printing a generic error, and continuing.

[BenChung]

FWIW, I think that this is a good example of a pull request that should be multiple commits; the changes being done are touching several different concerns (i.e. catching pyplot errors vs. setting up the CI itself) and having those be in separate commits. Regardless, I think it's good to go.