Support React 15.x autobinding

[romaindso]

BugFix for #10

[ghost]

+1 on fixing the issue #10
Still having issue with jasmineReact.render, as React.render on lines 14-15 in the PR does not exist.
Error:
TypeError: React.render is not a function at Object.render (specs/spec-mycontainer.js:9:1637659) at UserContext.<anonymous> (specs/spec-mycontainer.js:9:2111719)
Example Code:
let componentDidMountSpy = jasmineReact.spyOnClass(MyContainer, 'componentDidMount'); var myInstance = jasmineReact.render(<MyContainer />);