create #participants for conversaton
format created_at in message_presenter
restyle admin conversation and update feature spec.
remove css extension from stylesheets to fix tilt warnings
feature: admin can assign conversation to other admin
organize style sheets by components
unnest assignee resource
update user views to use new styles
Merge branch 'feature/convstream' into develop
admin can filter by assigned
create conversation_stream
create coversation composer
refactor messages controller
refactor: remove admin scoped controllers and just share with user scoped ones
make reply policy more expressive and test
add test for conversation composer
Merge branch 'feature/adminindex' into develop