Fix regression induced by Surface API change.
Adapt to new Container API.
Merge branch '0.2.x' of https://github.com/elifesciences/lens-outline into refactor
Merge remote-tracking branch 'origin/refactor' into composite_refactor
Adapt css classes reset.
Render outline only if needed.
Remove padding from outline.
Update styles.
Improved outline styles.
Make content outline disappear when panelHeight === contentHeight.
Merge branch 'prototype' into 0.2.x