Add support for creating a chart from the canvas id and prevent exceptions, at construction time, when the given item doesn't provide a valid CanvasRenderingContext2D or when the getContext API is not accessible (e.g. undefined by add-ons to prevent fingerprinting). New jasmine matcher to verify chart validity.
* Make Travis to deploy built files for tags
See https://docs.travis-ci.com/user/deployment/releases
* Remove and ignore dist/* files
Travis now builds and deploys these files for all tags, so we don't need to have them on the repository anymore.
* Add download links to the latest version
Remove outdated *standard build* and *bundled with Moment.js* links from the documentation and add a link to the latest GitHub release, from where the user can download `*.js` files.