[w3c/manifest] Respec validator (#740)

This change (choose one):

* [X] Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

Made a thing. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/740

-- Commit Summary --

  * testing that it works...
  * Revert "testing that it works..."
  * chore: use ReSpec Validator instead

-- File Changes --

    M .travis.yml (11)
    D tools/validate.js (58)

-- Patch Links --

https://github.com/w3c/manifest/pull/740.patch
https://github.com/w3c/manifest/pull/740.diff

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