Update react to version 15.0.2 🚀

Hello :wave:

:rocket::rocket::rocket:

react just published its new version 15.0.2, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of react – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

GitHub Release

React

Removed extraneous files from npm package. (@gaearon in #6388)
Ensure componentWillUnmount is only called once. (@jimfb in #6613)

ReactDOM

Fixed bug resulting in disabled buttons responding to mouse events in IE. (@nhunzaker in #6215)
Ensure <option>s are correctly selected when inside <optgroup>. (@trevorsmith in #6442)
Restore support for rendering into a shadow root. (@Wildhoney in #6462)
Ensure nested <body> elements are caught when warning for invalid markup. (@keyanzhang in #6469)
Improve warning when encountering multiple elements with the same key. (@hkal in #6500)

React TestUtils Add-on

Ensure that functional components do not have an owner. (@gaearon in #6362)
Handle invalid arguments to scryRenderedDOMComponentsWithClass better. (@ipeters90 in #6529)

React Perf Add-on

Ignore DOM operations that occur outside the batch operation. (@gaearon in #6516)

React Native Renderer

These files are now shipped inside the React npm package. They have no impact on React core or ReactDOM.

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GlimpseArchive / Glimpse.Client.Prototype