Add Webgility

[mpchadwick]

This is of interest per: https://gwillem.gitlab.io/2018/10/30/webgility-backdoor/

[codecov-io]

Codecov Report

Merging #151 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #151   +/-   ##
=======================================
  Coverage   54.52%   54.52%           
=======================================
  Files          27       27           
  Lines         829      829           
=======================================
  Hits          452      452           
  Misses        377      377

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