Added Export SVG (unstylized) button

Users can click the button to open a new browser tab/window to an SVG of
the sketch where then can then proceed to save the image as a .svg. This
skips making a round trip to the server.
Merge pull request #3 from tranek/svg-export

Added Export SVG (unstylized) button
Renamed function to match convention
Merge pull request #43 from tranek/develop

Added Export SVG (unstylized) button