Merge pull request #158 from AlexanderPico/release-0-9-0

squashing bugs
Merge pull request #160 from AlexanderPico/release-0-9-0

replaces image-not-available
Merge pull request #172 from AlexanderPico/release-0-9-0

fixes wikipathways/pathvisiojs#168
Merge pull request #173 from AlexanderPico/release-0-9-0

Fixes wikipathways/pathvisiojs#156
refactored svg vs. png handling code to address Issue #162. bug not fixed yet, but this is progress.
everything is on track to fix issue #162. committing now just before renaming pathway-svg to pathvisiojs-diagram
refactoring complete - issue #162 appears fixed.
minor update - add back signal to tests that diagram has finished loading. everything is now working. tests all pass.
works for everything except groups
Issue #162 is now fixed, and Alex's code from Commit 09c0810b577dcd3be8c3b143b5f0255f7b39dc89 is merged with this. All tests pass.
got text rendering well enough to push Issue #12 back to a later release
undid data uri for diagram loading icon
now reference to external loading icon and image not fund icon are working again.
updated container names to avoid confusion
using an iframe in compare.html now for both widgets
Issue #161 appears fixed.
center img (png) version of diagram
Merge pull request #24 from wikipathways/release-0-9-0

update ap:release with latest work and builds from wp:release