For ref:
    https://app.pluralsight.com/player?course=react-fundamentals&author=liam-mclennan&name=react-fundamentals-m2-components&clip=3&mode=live
    React Author Quiz sample

    for ref:
    Basic component definition and rendering 
    http://jsfiddle.net/kb3gn/428/

    Nested componenets 
    http://jsfiddle.net/kb3gn/364/

    State + Get Inital state
    http://jsfiddle.net/kb3gn/366/
    Counter doesn't change - so no need to use state 
    see same thing here that counter do change mye
    http://jsfiddle.net/kb3gn/367/


Default values

Validation of props: (If you don't see anything below is because React prop validation has failed)
    change Hello component params from b={3} to b={a number bigger then 5} /> to see results


    Mixings - adding a function to many componenets with retyping it 

   OnChange events - open the console to see everything you type in text box being logged

    componentDidMount - Is called immediately after the render function is finished (see console for tick have happened!)


    Chnaging a controlled componenet