[whatwg/dom] Meta: define merge policy and add CONTRIBUTING.md (#559)

Helps with https://github.com/whatwg/meta/issues/65.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/559

-- Commit Summary --

  * Meta: define merge policy and add CONTRIBUTING.md

-- File Changes --

    M .travis.yml (2)
    A CONTRIBUTING.md (1)
    M README.md (5)

-- Patch Links --

https://github.com/whatwg/dom/pull/559.patch
https://github.com/whatwg/dom/pull/559.diff

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