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changed name of stencils/template images from symbols to shapes
loading is working with png and then svg following
just use loading icon, not png pathway
Merge pull request #11 from wikipathways/master

latest changes
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