feat(chai): support openapi2 basepath

[tgiardina]

Summary

This PR replaces my our first attempt to implement base path support (#160; see also Issue #159). It accomplishes two things:

1. Implements basePath support for OpenApi2
2. Updates error messages so that OpenApi2 basePath and OpenApi3 server errors are handled consistently (see the discussion here).

Commits

• The first two commits specify the desired behavior (both in terms of basePath support and error messages) via tests.
• The third commit implements basePath support and the pertinent error messages.
• The fourth commit moves some shared functionality into the relevant utils file.
• The final commit adds me to AUTHORS.md.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@bdd04f2). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             master      #172   +/-   ##
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  Coverage          ?   100.00%           
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  Files             ?        33           
  Lines             ?       664           
  Branches          ?        47           
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  Hits              ?       664           
  Misses            ?         0           
  Partials          ?         0           

Impacted Files	Coverage Δ
...esponse-validator/lib/assertions/satisfyApiSpec.js	100.00% <100.00%> (ø)
.../lib/openapi-validator/lib/classes/OpenApi2Spec.js	100.00% <100.00%> (ø)
.../lib/openapi-validator/lib/classes/OpenApi3Spec.js	100.00% <100.00%> (ø)
...ponse-validator/lib/openapi-validator/lib/utils.js	100.00% <100.00%> (ø)

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[rwalle61]

Thanks very much! Will review when I can

[rwalle61]

Looks great, thanks a lot! Final few small name changes then we can merge!

Then I'll:

• port it to the jest plugin
• maybe rename "defined" to "provided" (see the comment below)
• update the Contributing.md as per your suggestions
• release :):)

[rwalle61]

Thank you for the updates! At a quick glance they look great. I'll give this a full final review asap and hopefully merge :)

[rwalle61]

Super!

For anyone looking at this in future, this satisfies

• the behaviour we agreed to in #160 (comment)
• the test cases we chose in #160 (comment)