react 0.14.2

Fixed bug with development build preventing events from firing in some versions of Internet Explorer & Edge
Fixed bug with development build when using es5-sham in older versions of Internet Explorer
Added support for integrity attribute
Fixed bug resulting in children prop being coerced to a string for custom elements, which was not the desired behavior
Moved react from dependencies to peerDependencies to match expectations and align with react-addons-* packages