Removed admin application

It does not serve well as an authentication component.
And its lack of foreign key support and pagination makes
it unusable for managing data yet.
(I wonder why it exists anyway.)
Various fixes for the migration of Padrino 0.11 -> 0.12
Moved from ActiveRecord to Sequel.
Removed further 'admin' component cruft
Gem updates
Fixed quotes in PostgreSQL full-text search query
Fixed a mission change from ActiveRecord to Sequel
Removed Redis and ActiveRecord cruft
Fixed Gemfiles to work with desired set of components
Removed navigation in preparation for better breadcrumbs
Added Sequel schema migrations