Stop using Google Charts for the 2-Factor-Auth QR-Code (#1044)

vendors/qr.js/INSTALL.md

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+This document is only relevant for those that want to contribute to the [qr.js][] open source
+project (we love you guys!). If you are only interested in installing the tool look at `README.md`.
+
+## Build Requirements
+
+In order to build [qr.js][], you need to have the following install [git][] 1.7+ and [node.js][]
+0.8+ (which includes [npm][]).
+
+### Canvas Support
+
+[qr.js][] heavily depends on [node-canvas][] to support the HTML5 canvas element in the [node.js][]
+environment. Unfortunately, this library is dependant on [Cairo][], which is not managed by
+[npm][]. Before you are able to build [qr.js][] (and it's dependencies), you must have [Cairo][]
+installed. Please see their wiki on steps on how to do this on various platforms:
+
+https://github.com/LearnBoost/node-canvas/wiki/_pages
+
+## Building
+
+Follow these steps to build [qr.js][];
+
+1. Clone a copy of the main [qr.js git repository](https://github.com/neocotic/qr.js) by running
+   `git clone git://github.com/neocotic/qr.js.git`
+2. `cd` to the repository directory
+3. Ensure you have all of the dependencies by entering `npm install`
+4. Ensure you can run [Grunt][] by running `npm install -g grunt-cli`
+5. To run the full test suite enter `grunt test`
+   * **Pro Tip:** You can easily run step 5 by just entering `grunt`
+6. To update the optimized distributable file and documentation enter `grunt dist`
+   * Outputs to documentation to the `docs` directory
+
+## Important
+
+If you're planning on contributing to [qr.js][] please do **NOT** update the distributable file or
+documentation (step 6) when submitting a pull request. We will not accept pull requests when these
+files have been changed as we do this ourselves when finalizing a release.
+
+Read the `CONTRIBUTING.md` file for more information about submitting pull requests.
+
+[cairo]: http://cairographics.org
+[git]: http://git-scm.com
+[grunt]: http://gruntjs.com
+[node.js]: http://nodejs.org
+[node-canvas]: https://github.com/LearnBoost/node-canvas
+[npm]: http://npmjs.org
+[qr.js]: http://neocotic.com/qr.js