Version 5.14.2

### Bugfixes

Push a new package to NPM due to an [NPM bug](https://github.com/npm/npm/issues/5082) omitting the LICENSE file in 5.14.0.

Set `dataTransfer.effectAllowed` in `dragstart` handler to help browsers use the right drag icon.

Add the [mbox mode](http://codemirror.net/mode/mbox/index.html) to `mode/meta.js`.

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