added ancestry gem

Signed-off-by: dan-hoerr <dhoerr@gmail.com>
migrated parent_id relationship to ancestry, removed relationship code from model, added migration to remove column from table

Signed-off-by: dan-hoerr <dhoerr@gmail.com>
moved nested sortable to vendor asset location, translated admin javascript to coffeescript

Signed-off-by: dan-hoerr <dhoerr@gmail.com>
roughed in page sorting

Signed-off-by: dan-hoerr <dhoerr@gmail.com>