Extracted url-utils package from Ghost core (TryGhost#114)

refs TryGhost/Ghost#10773

- Extraction of common Ghost URL utils out of core based on https://github.com/TryGhost/Ghost/blob/2.23.3/core/server/services/url/utils.js utility package.

packages/url-utils/.eslintrc.js

@@ -0,0 +1,6 @@
+module.exports = {
+    plugins: ['ghost'],
+    extends: [
+        'plugin:ghost/node',
+    ]
+};

packages/url-utils/LICENSE

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+MIT License
+
+Copyright (c) 2019 Ghost Foundation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/url-utils/README.md

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+# Url Utils
+
+## Install
+
+`npm install @tryghost/url-utils --save`
+
+or
+
+`yarn add @tryghost/url-utils`
+
+
+## Usage
+
+
+## Develop
+
+This is a mono repository, managed with [lerna](https://lernajs.io/).
+
+Follow the instructions for the top-level repo.
+1. `git clone` this repo & `cd` into it as usual
+2. Run `yarn` to install top-level dependencies.
+
+
+## Run
+
+- `yarn dev`
+
+
+## Test
+
+- `yarn lint` run just eslint
+- `yarn test` run lint and tests
+
+
+
+
+# Copyright & License
+
+Copyright (c) 2019 Ghost Foundation - Released under the [MIT license](LICENSE).

packages/url-utils/lib/deduplicate-slashes.js

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+function deduplicateDoubleSlashes(url) {
+    return url.replace(/\/\//g, '/');
+}
+
+module.exports = deduplicateDoubleSlashes;