Samples need to be packaged with built libraries (which one have been removed from the repository), so create a new `gulp package` task to generate a ZIP archive with dist files, samples and the license file. This archive is generated in the ./dist/ folder and will be deployed by Travis along the GH release. Note that the ./dist/ folder is not preserved but merged in the archive root. Also change samples requiring moment.js to load this lib from the CDN instead of the ./node_module folder.
* 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Remove outdated *standard build* and *bundled with Moment.js* links from the documentation and add a link to the latest GitHub release, from where the user can download `*.js`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.