Properly nest db folder.
When Spree::ActiveShipping::Config[:shipper_number] is "", an empty ShipperNumber node is added to the request, resulting in a "Missing/Invalid Shipper/ShipperNumber" error response from UPS.

By adding .presence, we can have it treat a "" value as nil so that it will skip adding the
ShipperNumber node when shipper_number is "" instead of treating "" as a truthy value.

Fixes #57
Removing duplicate Fedex Shippings, Fixes #58
Fix link_to_remove_fields usage in product_packages/index.html.erb

Fixes #62
Remove clear_product_packages attribute which had no bearing on anything
Get calculators showing up in application again
Handle new spree package format
Bump version number
Updated versionfile
Add spree to gemfile instead of gemspec until gem is released
Make this work on Spree 2.0.0.beta
Document the need to run the install and run the migrations
Fix rake test_app command
- Specs aren't passing, but at least they can be run now
Port to Spree 2.0 translations.
Merge pull request #65 from rterbush/translations

Port to Spree 2.0 translations.
Use Engine.routes.prepend

Instead of Engine.routes.draw so that Spree core routes are always
loaded first

[Fixes #68]
Update master branch versions to point to 2.1.x.beta.
Fix spec file mistake for update to 2.1.0.beta
Merge pull request #79 from rterbush/fix-spec

Upgrade to 2.0 and look forward to 2.1.0.beta
Port to Package object input