Update react to version 15.2.1 🚀

Hello lovely humans,

react just published its new version 15.2.1.

State	Update :rocket:
Dependency	react
New version	15.2.1
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of react. Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right? Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project :sparkles:

You rock!

:palm_tree:

GitHub Release

React

Fix errant warning about missing React element. (@gaearon in #7193)
Better removal of dev-only code, leading to a small reduction in the minified production bundle size. (@gaearon in #7188, #7189)

React DOM

Add stack trace to null input value warning. (@jimfb in #7040)
Fix webcomponents example. (@jalexanderfox in #7057)
Fix unstable_renderSubtreeIntoContainer so that context properly updates when linked to state. (@gaearon in #7125)
Improve invariant wording for void elements. (@starkch in #7066)
Ensure no errors are thrown due to event handlers in server rendering. (@rricard in #7127)
Fix regression resulting in value-less submit and reset inputs removing the browser-default text. (@zpao in #7197)
Fix regression resulting in empty name attribute being added to inputs when not provided. (@okonet in #7199)
Fix issue with nested server rendering. (@Aweary in #7033)

React Perf Add-on

Make ReactPerf.start() work properly during lifecycle methods. (@gaearon in #7208).

React CSSTransitionGroup Add-on

Fix issue resulting in spurious unknown property warnings. (@batusai513 in #7165)

React Native Renderer

Improve error handling in cross-platform touch event handling. (@yungsters in #7143)

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GlimpseArchive / Glimpse.Client.Prototype