Update pan-zoom.css
updated how to load custom shapes and also corrected bug in pathvisio dev viewer
pulled kh changes
Merge pull request #12 from wikipathways/gh-pages

update for dev viewer bug
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css
Update pan-zoom.css