Data Labels added for Bar graph

[sujeetpillai]

I've added options to display Data Labels ( y values inside the bar like in excel) into the Bar chart. Default is set to not display. It adheres to the yLabelFormat and has options to set font, size, color, position, etc.

dataLabels:true/false,
dataLabelsPosition:'inside'/'outside',
dataLabelsFamily: 'sans-serif' // Font Family,
dataLabelsSize:14 // Font Size
dataLabelsWeight: 'bold' // Font Weight
dataLabelsColor: '#fff' // Font Color

Have also added a new example for the same.

Note: The change on line 1507 (new) from morris.js in the diff below isn't something I changed. I'm guessing the morris.bar.coffee file in the master was a bit newer than the morris.js built file.

[pierresh]

Thanks a lot for your commit, that works perfectly!