add gems, add functionality

better errors
add functionality to display attachments and documents related to
products.
models
new model
update
update read me
prep for ActiveAdmin
activeadmin-mongoid
use activeadmin-mongoid rails4 branch
DIRTY generated scaffolds

everything is expected to be broken still
begin work on html layout re-integration
carrier wave back in (temporarily)
acts as tag gable gem
actsastaggable migrated / remove broken @attachments.each from products _form
remove nested form for attachment
sassify
use selectize for tags input
restore foundation customizations
fixed product show page, remove missing functionality
added up loaders
fix image upload