chore(package.json): upgrade react to ^0.12
chore(client): migrate to React.createFactory
style(src): remove all jsx pragma
chore(webpack.config.js): expose React to global
chore(ToastContainer): remove transferPropsTo usage with spread operator
chore(client): replace React.renderComponent with render
feat(ToastContainer): toastMessageClass changed to toastMessageFactory

BREAKING CHANGE: propTypes renamed to toastMessageFactory

toastMessageFactory now only accepts the result of calling React.createFactory(ReactElementClass).
docs(README.md): upgrade docs for React 0.12
feat(lib): upgrade React to 0.12
chore(package.json): bump version to 1.1.0