pass MetaData to alembic

this allows to use the autogenerate feature
abstract area title

This makes it easy to resolve an area identifier (e.g.
'proposals' or 'overview') to a human readble (and translated)
title.
Merge pull request #744 from xi/feature-area-title

abstract area title
Merge pull request #743 from xi/feature-alembic-autogen

pass MetaData to alembic
fix proposal inline pager showhide_button
Add export create_time to comments and proposals
Add timezone for metadata.time
Add timezone to encode_time