Export product category store sale to csv

Create a way to export 4 table to db/csvs/
Make csvs as default seeds.

So run rake db:seed can create the 4 tables with data.
No need to repeatly import the excel files.
ignore DS_Store && bugfix
Merge branch 'feature/init-seeds' into develop
add the design doc
rm \N in csv
add navbars
change layout
bugfix for some views
mv notice to layout
Merge branch 'feature/link-all-pages' into develop
add scope model_store for store
add datatable for store
add database for regions
Merge branch 'feature/store-related' into develop
Merge branch 'develop' of github.com:alanqian/ispace into develop

Conflicts:
	app/models/store.rb
	app/views/plan_sets/_form.html.erb