added chart-horizontal-bar for horizontal bar charts

[Stormsys]

Is horizontal chart built into the charjs library? i cant find it on their documentation - i think its a third party library which you havn't reference in this commit?

[trading-peter]

@Stormsys I think he means:

var myBarChart = new Chart(ctx, {
    type: 'horizontalBar',
    data: data,
    options: options
});

Found in the bar chart section right before the data structure part.

[Stormsys]

Ah yes - okay looks good to me so il approve. Thanks for the contribution :)