Added simple react table component

What do think of these functions:

    var thWrap = function(content) {
      return <th>{content}</th>
    }

    var tdWrap = function(content) {
      return <td>{content}</th>
    }

    var createRow = function(wrapFunction) {
      return function(keys) {
        return <tr> {_.map(keys, wrapFunction)} </tr>
      }
    }

You would use them like this:

    {createRow(thWrap)(Object.keys(this.state.mockFitBitData[0]))}
    {this.state.mockFitBitData.map(createRow(tdWrap))}

But does React have a utility function for the first two? Something like:

    wrapThingInElement = function(thing, element) {
      return <element> {thing} </element
    }