Added watchExtraFiles to schema

[devpaul]

Type: feature

Description:

Adds watchExtraFiles to the schema.json

Resolves #362

[codecov]

Codecov Report

Merging #373 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #373   +/-   ##
=======================================
  Coverage   48.92%   48.92%           
=======================================
  Files          10       10           
  Lines         695      695           
  Branches      199      199           
=======================================
  Hits          340      340           
  Misses        355      355

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[agubler]

Can we add the watchExtraFiles option to the test-app's dojorcs?