Switched role images to unified style
(cherry picked from commit e454470246864ca6f47e92300e2996029a79e2c5)
Update widgets/ERGChemical/ERGChemicalWidget.mxml

Fixed typo in the word "Emergency"
(cherry picked from commit c6b3fe8e118fb1f699cc0103de8c5fd99d050844)
Added ArcGIS version to README
(cherry picked from commit 0abbbcc5bab0391f624696336edde028f75abec8)