D3 code for graphs

Code to render horizontal bar graphs. Changing the localData and
chicagoData objects and redrawing the chart will update the plots.
Adding basic docmentation without style
Adding SongKick API to get few events happening around given latitude and longitude
minor content added regarding songkick api
merge master
show graphs mockup
Merge branch 'paul_merge' of https://github.com/vis-project-4/vis-project-3.github.io into paul_merge
add get data