Give USPS Priority Mail Medium Flat Rate Box class file to correct name
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 to use deface extension and add a cancan check for editing product packages.
add .bundle to ignore
reload the product to make sure no stale packages are present.

Fixes #184
Fix zero weight check on services with regression test fixes #167
Update add_product_packages_tab.html.erb.deface

Update icon to use font awesome css