Webstaff: Webpack dependency ajv missing warning after npm install

[Cesar V]

Looks like there's some dependency wierdness with AJV (a json validator).
Currently when installing from the latest working master (after the pinning of AngularJs to @~1.6.x) I get a warning: ERR! peer dep missing: ajv@^6.0.0, required by ajv-keywords@3.1.0

Looks like webpack (resolved to v3.12) depends on ajv@^6.1.0 and ajv-keywords@^3.1.0, at the same time ajv-keywords depends on @ajv@^6.0.0 -- which is fine and would mean that the latest x in ajv@6.x would get installed but that doesn't seem to be happening for some reason, and thus we get the warning.

I poked at this for a bit but not being versed how to resolve these dependency shenanigans, I figure I'll go ahead and report it.

The webstaff still works fine, however, as AJV is a webpack dependency for something that apparently we're not needing/using at the moment.