add NetworkState
set activity navigation as representational class
add ChecklistColor#getColorDrawable
fix invalid updaet when checklist changed
use cache in WebView when network is unreachable
add ActionViewActionProvider
add CircleLinkType as type of url
add Circle.Builder(Circle)
add CircleSearchOptionContainer#addTextChangedListener
fix can't hide soft input
remove unused resource
add common drawable icon as "attatchment"