Move `DragDrop` plugin to `@uppy/drag-drop`.

Steps taken:

```bash
cp -R package-template packages/@uppy/drag-drop
vim packages/@uppy/drag-drop/{README.md,package.json}
vim src/react/DragDrop.js src/index.js # Update requires
vim packages/@uppy/drag-drop/package.json # Add dependencies
```

packages/@uppy/drag-drop/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 Transloadit
+
+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/@uppy/drag-drop/README.md

@@ -0,0 +1,42 @@
+# @uppy/drag-drop
+
+<img src="https://uppy.io/images/logos/uppy-dog-head-arrow.svg" width="120" alt="Uppy logo: a superman puppy in a pink suit" align="right">
+
+<a href="https://www.npmjs.com/package/@uppy/drag-drop"><img src="https://img.shields.io/npm/v/@uppy/drag-drop.svg?style=flat-square"></a>
+<a href="https://travis-ci.org/transloadit/uppy"><img src="https://img.shields.io/travis/transloadit/uppy/master.svg?style=flat-square" alt="Build Status"></a>
+
+Droppable zone UI for Uppy. Drag and drop files into it to upload.
+
+**[Read the docs](https://uppy.io/docs/dragdrop)** | **[Try it](https://uppy.io/examples/dragdrop/)**
+
+Uppy is being developed by the folks at [Transloadit](https://transloadit.com), a versatile file encoding service.
+
+## Example
+
+```js
+const Uppy = require('@uppy/core')
+const DragDrop = require('@uppy/drag-drop')
+
+const uppy = Uppy()
+uppy.use(DragDrop, {
+  target: '#upload'
+})
+```
+
+## Installation
+
+```bash
+$ npm install @uppy/drag-drop --save
+```
+
+We recommend installing from npm and then using a module bundler such as [Webpack](http://webpack.github.io/), [Browserify](http://browserify.org/) or [Rollup.js](http://rollupjs.org/).
+
+Alternatively, you can also use this plugin in a pre-built bundle from Transloadit's CDN: Edgly. In that case `Uppy` will attach itself to the global `window.Uppy` object. See the [main Uppy documentation](https://uppy.io/docs/#Installation) for instructions.
+
+## Documentation
+
+Documentation for this plugin can be found on the [Uppy website](https://uppy.io/docs/dragdrop).
+
+## License
+
+[The MIT License](./LICENSE).

packages/@uppy/drag-drop/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "@uppy/drag-drop",
+  "description": "Droppable zone UI for Uppy. Drag and drop files into it to upload.",
+  "version": "0.25.5",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "jsnext:main": "src/index.js",
+  "types": "types/index.d.ts",
+  "keywords": [
+    "file uploader",
+    "uppy",
+    "uppy-plugin",
+    "drag-drop",
+    "drag",
+    "drop",
+    "dropzone",
+    "upload"
+  ],
+  "homepage": "https://uppy.io",
+  "bugs": {
+    "url": "https://github.com/transloadit/uppy/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/transloadit/uppy.git"
+  },
+  "dependencies": {
+    "@uppy/utils": "^0.25.5",
+    "drag-drop": "^2.14.0"
+  },
+  "peerDependencies": {
+    "@uppy/core": "^0.25.5"
+  }
+}

src/index.js

@@ -11,7 +11,7 @@ const Plugin = require('@uppy/core/lib/Plugin')
 
 // Acquirers
 const Dashboard = require('./plugins/Dashboard')
-const DragDrop = require('./plugins/DragDrop')
+const DragDrop = require('@uppy/drag-drop')
 const FileInput = require('./plugins/FileInput')
 const GoogleDrive = require('./plugins/GoogleDrive')
 const Dropbox = require('./plugins/Dropbox')

src/react/DragDrop.js

@@ -1,5 +1,5 @@
 const React = require('react')
-const DragDropPlugin = require('../plugins/DragDrop')
+const DragDropPlugin = require('@uppy/drag-drop')
 const propTypes = require('./propTypes')
 
 const h = React.createElement

src/react/DragDrop.test.js

@@ -7,7 +7,7 @@ beforeAll(() => {
   configure({ adapter: new ReactAdapter() })
 })
 
-jest.mock('../plugins/DragDrop', () => require('./__mocks__/DragDropPlugin'))
+jest.mock('@uppy/drag-drop', () => require('./__mocks__/DragDropPlugin'))
 
 const DragDrop = require('./DragDrop')