Add FIPS State Codes to CPS

[andersonfrailey]

This PR complements PR #126 in the TaxData repo. It adds the FIPS state code associated with each tax unit in the CPS file.

cc @MattHJensen

[MattHJensen]

LGTM and merging once checks complete. Thanks @andersonfrailey.

Needs caveated documentation in index.html @andersonfrailey.

[andersonfrailey]

Fixing those tests.

[codecov-io]

Codecov Report

Merging #1653 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1653   +/-   ##
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  Coverage     100%    100%           
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  Files          37      37           
  Lines        2856    2856           
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  Hits         2856    2856

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[andersonfrailey]

Seems like the test failure is due to rounding error. I looked and each error was .1, which is why it failed on 2.7 but not 3.6. I updated the CPS expected text file so that it would pass both.

[MattHJensen]

Seems like the test failure is due to rounding error. I looked and each error was .1, which is why it failed on 2.7 but not 3.6. I updated the CPS expected text file so that it would pass both.

Do you know why the results changed at all? I would have thought there'd be no change.

[MattHJensen]

Merging, but would still like a followup on why the tests changed at all.