DevShell: fix handling of collection stores so in-place mods work (#3119)
DevShell: fix handling of collection stores so in-place mods work (#3119)

* DevShell: fix handling of collection stores so in-place mods work

* Tweak json data display

PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs