fix(session): resolve identity only if we have valid token

SD-1085
Merge pull request #549 from petrjasek/devel

fix(session): resolve identity only if we have valid token
feat(metadata): Enable metadata editing in article edit screen
fix(archive): display abstract in preview pane
fix(authoring): Minor authoring UI fixies
fix(metadata): fix spacing
fix(authoring): unlock item when it was locked

when there were no changes to item there was no unlocking

SD-1084
fix(stages): Fix spiking vs active stage
fix(spiking): Fix styling for spike info
fix(metadata): Add missing fields
fix(spiking): Rename 'Spike' label