API reference for preprocessing library

[dphogan]

Description

Adds API Reference for preproc subpackage.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected - these changes will not be merged until major releases!)

How Has This Been Tested?

Not yet tested; will be examined on readthedocs

Checklist:

• [ ] My PR has a descriptive title
• [ ] My code follows PEP8
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new errors
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] My PR passes Travis CI tests
• [ ] My PR does not reduce coverage in Codecov

If your PR does not fulfill all of the requirements in the checklist above, that's OK! Just prepend [WIP] to the PR title until they are all satisfied. If you need help, @-mention a maintainer and/or add the Status: Help Needed label.

[codecov[bot]]

Codecov Report

Merging #363 into dev will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #363   +/-   ##
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  Coverage   57.38%   57.38%           
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  Files          77       77           
  Lines        6420     6420           
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  Hits         3684     3684           
  Misses       2736     2736           

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