Give USPS Priority Mail Medium Flat Rate Box class file to correct name
Use Spree 2.3.0.beta
Fix for already initialized constant errors

Fixes #176
Fixes #147
Fixes #75
Guard against missing shipping_method calculators

Fixes #176
Fixes #174
Fixes #75
Update overrides
Update overrides to use deface extension and add a cancan check for editing product packages.
Add sass-rails to gemspec.
add .bundle to ignore
reload the product to make sure no stale packages are present.

Fixes #184

Conflicts:
	spec/models/weight_limits_spec.rb
Fixing typos
Merge pull request #185 from brchristian/patch-3

Fixing typos