Addded Diaspora::Likeable module.  Corrected the unique index for likes to include author_id; extracted before_save callback needed for tags into Diaspora::Taggable.

Huge commit I know, but move show and destroy routes into PostsController and PostsController#show into PublicsController

Corrected german translation (from noun to verb for 'mention')

Revert "escape js in format_tags until I can think about whether we have an XSS problem in the morning"

This reverts commit 8af95909.