Move all CouchDB startup logic to multicouch

Related:
 - Original PR: https://github.com/hoodiehq/hoodie-server/pull/80/f
 - Corresponding commit in multiouch https://github.com/hoodiehq/node-multicouch/commit/5885fdc15012259b6bd86ae4e3a4344d4d935b2a
 - error on Windows: https://github.com/hoodiehq/hoodie-server/issues/153
 - older issue with similar scope: https://github.com/hoodiehq/hoodie-server/issues/94