clean up shared code just so atc runs again
remove oer.images.loaded hack
update the save and dirty marking code in atc
Merge pull request #35 from oerpub/fix3-atc-base

update the save and dirty marking code in atc
Merge pull request #34 from oerpub/fix2-loading

remove oer.images.loaded hack
Merge pull request #33 from oerpub/fix1-atc-shared

clean up shared code just so atc runs again