Bump activemerchant to 1.42.3
Don't use hard coded assets prefix

Fixes #4156
Remove variant default_scope from Price class this fixes Price must belong to a variant when trying to fetch the price fo a deleted variant

Fixes #4169
Add CHANGELOG entry for js responder security fix
No need to call gemspec in common_spree_dependencies

Each component Gemfile already calls it
Bump to awesome_nested_set 3.0.0.rc.3
Fix states_required references for countries that don't actually need states

See:

* http://en.wikipedia.org/wiki/Address_(geography)#Switzerland
* http://bitboost.com/ref/international-address-formats/switzerland/
* http://geneva.angloinfo.com/information/housing/post-codes/
* http://en.wikipedia.org/wiki/Address_(geography)#Malaysia

And other online sources.  May need to review additional countries referenced in d0585271b7bc8a285b7ffdbeb1af45bdfece1e22
Add inverse_of to associations between shipping methods and rates

Fixes #4168
Prevents admin js errors by ensuring taxons key in api response

Fixes #4174
Append omega to content classes

Fixes #4179
Order#available_payment_methods should also return payment methods marked as 'Both'

Fixes #4199
Bump acts_as_list to 0.3.0
Fix migration to support legacy stores with deleted variants and line items

Fixes #4178
Add changelog for Taxonomies menu move
Fleshed out core Changelog for adjustments refactoring
Fixed sample crashing due to acts_as_list in Classification

Reverse order of table_name= and acts_as_list in Classification and blammo it fixed it.
Make it clearer that the 'payment_method' factory is actually for checks, by renaming it to 'check_payment_method'
Give credit card payment factories better names
Submitting payments through the admin backend now works once again

The object params were not passing through the name attribute, causing validation errors. The controller was not showing these validation errors.

Fixes #4129
Convert credit card expiry values to integers

Fixes #4188