Add package-lock to repo.

If we version composer.lock, we should do the smae for package-lock.

package-lock.json

+{
+  "name": "yarn",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "ansicolors": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/ansicolors/-/ansicolors-0.2.1.tgz",
+      "integrity": "sha1-vgiVmQl7dKXJxKhKDNvNtivYeu8="
+    },
+    "async": {
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.1.tgz",
+      "integrity": "sha512-fNEiL2+AZt6AlAw/29Cr0UDe4sRAHCpEHh54WMz+Bb7QfNcFw4h3loofyJpLeQs4Yx7yuqu/2dLgM5hKOs6HlQ==",
+      "requires": {
+        "lodash": "4.17.11"
+      }
+    },
+    "cardinal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/cardinal/-/cardinal-1.0.0.tgz",
+      "integrity": "sha1-UOIcGwqjdyn5N33vGWtanOyTLuk=",
+      "requires": {
+        "ansicolors": "0.2.1",
+        "redeyed": "1.0.1"
+      }
+    },
+    "clipboard": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-2.0.4.tgz",
+      "integrity": "sha512-Vw26VSLRpJfBofiVaFb/I8PVfdI1OxKcYShe6fm0sP/DtmiWQNCjhM/okTvdCo0G+lMMm1rMYbk4IK4x1X+kgQ==",
+      "requires": {
+        "good-listener": "1.2.2",
+        "select": "1.1.2",
+        "tiny-emitter": "2.0.2"
+      }
+    },
+    "csv-parse": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/csv-parse/-/csv-parse-2.5.0.tgz",
+      "integrity": "sha512-4OcjOJQByI0YDU5COYw9HAqjo8/MOLLmT9EKyMCXUzgvh30vS1SlMK+Ho84IH5exN44cSnrYecw/7Zpu2m4lkA=="
+    },
+    "delegate": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/delegate/-/delegate-3.2.0.tgz",
+      "integrity": "sha512-IofjkYBZaZivn0V8nnsMJGBr4jVLxHDheKSW88PyxS5QC4Vo9ZbZVvhzlSxY87fVq3STR6r+4cGepyHkcWOQSw=="
+    },
+    "esprima": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-3.0.0.tgz",
+      "integrity": "sha1-U88kes2ncxPlUcOqLnM0LT+099k="
+    },
+    "font-awesome": {
+      "version": "4.7.0",
+      "resolved": "https://registry.npmjs.org/font-awesome/-/font-awesome-4.7.0.tgz",
+      "integrity": "sha1-j6jPBBGhoxr9B7BtKQK7n8gVoTM="
+    },
+    "good-listener": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/good-listener/-/good-listener-1.2.2.tgz",
+      "integrity": "sha1-1TswzfkxPf+33JoNR3CWqm0UXFA=",
+      "requires": {
+        "delegate": "3.2.0"
+      }
+    },
+    "humanize": {
+      "version": "0.0.9",
+      "resolved": "https://registry.npmjs.org/humanize/-/humanize-0.0.9.tgz",
+      "integrity": "sha1-GZT/rs3+nEQe0r2sdFK3u0yeQaQ="
+    },
+    "jquery": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/jquery/-/jquery-3.3.1.tgz",
+      "integrity": "sha512-Ubldcmxp5np52/ENotGxlLe6aGMvmF4R8S6tZjsP6Knsaxd/xp3Zrh50cG93lR6nPXyUFwzN3ZSOQI0wRJNdGg=="
+    },
+    "jquery-ui": {
+      "version": "1.12.1",
+      "resolved": "https://registry.npmjs.org/jquery-ui/-/jquery-ui-1.12.1.tgz",
+      "integrity": "sha1-vLQEXI3QU5wTS8FIjN0+dop6nlE="
+    },
+    "lodash": {
+      "version": "4.17.11",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
+      "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg=="
+    },
+    "microplugin": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/microplugin/-/microplugin-0.0.3.tgz",
+      "integrity": "sha1-H8Lhu3yeGegr2Eu6kTe75xJQ2M0="
+    },
+    "minimist": {
+      "version": "0.0.10",
+      "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz",
+      "integrity": "sha1-3j+YVD2/lggr5IrRoMfNqDYwHc8="
+    },
+    "optimist": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/optimist/-/optimist-0.6.1.tgz",
+      "integrity": "sha1-2j6nRob6IaGaERwybpDrFaAZZoY=",
+      "requires": {
+        "minimist": "0.0.10",
+        "wordwrap": "0.0.3"
+      }
+    },
+    "purecss": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/purecss/-/purecss-1.0.0.tgz",
+      "integrity": "sha512-gfC78WCOWNnfkzulx9aoWwcl+0JflhwKeJ+k9s/ZyIawfYNA4bqBmt0DtfgtQK9iuYMtGfbdE8R2AQMjSWR2VQ=="
+    },
+    "redeyed": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/redeyed/-/redeyed-1.0.1.tgz",
+      "integrity": "sha1-6WwZO0DAgWsArshCaY5hGF5VSYo=",
+      "requires": {
+        "esprima": "3.0.0"
+      }
+    },
+    "select": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/select/-/select-1.1.2.tgz",
+      "integrity": "sha1-DnNQrN7ICxEIUoeG7B1EGNEbOW0="
+    },
+    "selectize": {
+      "version": "0.12.6",
+      "resolved": "https://registry.npmjs.org/selectize/-/selectize-0.12.6.tgz",
+      "integrity": "sha512-bWO5A7G+I8+QXyjLfQUgh31VI4WKYagUZQxAXlDyUmDDNrFxrASV0W9hxCOl0XJ/XQ1dZEu3G9HjXV4Wj0yb6w==",
+      "requires": {
+        "microplugin": "0.0.3",
+        "sifter": "0.5.3"
+      }
+    },
+    "sifter": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/sifter/-/sifter-0.5.3.tgz",
+      "integrity": "sha1-XmUH/owRSyso2Qtr9OW2NuYR5Is=",
+      "requires": {
+        "async": "2.6.1",
+        "cardinal": "1.0.0",
+        "csv-parse": "2.5.0",
+        "humanize": "0.0.9",
+        "optimist": "0.6.1"
+      }
+    },
+    "tiny-emitter": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.0.2.tgz",
+      "integrity": "sha512-2NM0auVBGft5tee/OxP4PI3d8WItkDM+fPnaRAVo6xTDI2knbz9eC5ArWGqtGlYqiH3RU5yMpdyTTO7MguC4ow=="
+    },
+    "wordwrap": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
+      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc="
+    }
+  }
+}