Saving graph as SVG and creating left partion for graph metadata

 - Button provided on graph div to save (download) graph as HTML. This downloaded graph can be viewed and edited in software like **inkscape** can be downloaded from [this](http://www.inkscape.org/en/download/linux/) link.

 - Created *graph info panel* on LHS of graph. This can be used in the future for listing check-boxes and some other purposes.