Fix missing attribute.
Materialize issue and milestone edit activities.
There's no need for loading data we already have.
Include issue / PR header into activity header.

Still needs some logic to scroll it out when scrolling the list, though.
Fix ToolBar popup theme.
Optimize issue/PR headers to use less space.
Fix FAB appearing too early.
Fix exception being thrown when starting without network.
Sometimes Stack seems to be interpreted as ArrayList on unparceling.

... so better be explicit about it.
Fix crash when opening label dialog.
Update version code.