Sync IDL files with wpt upon changes to the master branch (#21)

Fixes #20.

.travis.yml

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+branches:
+  only:
+    - master
+language: node_js
+node_js:
+  - "8"
+install:
+  - cd wpt-sync
+  - npm install
+  - git clone --single-branch https://github.com/web-platform-tests/wpt.git
+  - cd wpt
+  - git remote add fork https://autofoolip:[email protected]/autofoolip/wpt.git
+  - git fetch -q fork
+  - git push -q fork master
+  - git config user.email "[email protected]"
+  - git config user.name "Automat af Gränssnitt"
+  - cd ..
+script:
+  - GH_USER=autofoolip node sync.js --wpt-dir wpt --build-url https://travis-ci.org/tidoust/reffy-reports/builds/$TRAVIS_BUILD_ID

wpt-sync/.gitignore

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+node_modules/
+wpt/

wpt-sync/README.md

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+This code copies `*.idl` files from [whatwg/idl/](/whatwg/idl/) in this repo
+into [interfaces/](https://github.com/web-platform-tests/wpt/tree/master/interfaces) in wpt.
+
+Branches are maintained on a fork of [wpt](https://github.com/web-platform-tests/wpt),
+and pull requests are automatically created based on those branches.
+
+## Running locally
+
+Required environment variables:
+ * `GH_USER` must be set to the name of a GitHub which has a fork of wpt.
+ * `GH_TOKEN` must be set to a
+   [personal access token](https://github.com/settings/tokens/new) with the
+   "Access public repositories" (public_repo) scope enabled.
+
+A local checkout of wpt must exist with a remote named `fork` pointing to
+`GH_USER`'s fork of wpt.
+
+Then, run the script as `node sync.js --wpt-dir /path/to/wpt`.
+
+Run `node sync.js --help` for all supported options.

wpt-sync/package.json

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+{
+  "dependencies": {
+    "@octokit/rest": "^15.9.6",
+    "flags": "^0.1.3"
+  }
+}