Update react to version 15.1.0 🚀

Hello :wave:

:rocket::rocket::rocket:

react just published its new version 15.1.0, 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

Ensure we're using the latest object-assign, which has protection against a non-spec-compliant native Object.assign. (@zpao in #6681)
Add a new warning to communicate that props objects passed to createElement must be plain objects. (@richardscarrott in #6134)
Fix a batching bug resulting in some lifecycle methods incorrectly being called multiple times. (@spicyj in #6650)

React DOM

Fix regression in custom elements support. (@jscissr in #6570)
Stop incorrectly warning about using onScroll event handler with server rendering. (@Aweary in #6678)
Fix grammar in the controlled input warning. (@jakeboone02 in #6657)
Fix issue preventing <object> nodes from being able to read <param> nodes in IE. (@syranide in #6691)
Fix issue resulting in crash when using experimental error boundaries with server rendering. (@jimfb in #6694)
Add additional information to the controlled input warning. (@borisyankov in #6341)

React Perf Add-on

Completely rewritten to collect data more accurately and to be easier to maintain. (@gaearon in #6647, #6046)

React Native Renderer

Remove some special cases for platform specific branching. (@sebmarkbage in #6660)
Remove use of merge utility. (@sebmarkbage in #6634)
Renamed some modules to better indicate usage (@javache in #6643)

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holidaycheck / react-google-tag-manager