Replace areas.def with areas.yaml

[mraspaud]

Replace areas.def with areas.yaml, as yaml is the new format for area definitons.

• Closes #xxxx
• Tests added
• Tests passed
• Passes git diff origin/master **/*py | flake8 --diff
• Fully documented

[coveralls]

Coverage remained the same at 73.078% when pulling 1012fec on feature-areas-yaml into 4e1e149 on master.

[codecov]

Codecov Report

Merging #442 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #442   +/-   ##
=======================================
  Coverage   73.07%   73.07%           
=======================================
  Files         134      134           
  Lines       17662    17662           
=======================================
  Hits        12907    12907           
  Misses       4755     4755

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[djhoese]

Do we need to modify MANIFEST.in?

[mraspaud]

doesn't seem so, but thanks for the reminder, I hadn't thought of that.