Update changelogs
Deleted shipping methods are now accessible from a shipping rate

Fixes #3829
Ensure Coupon Applicator actually, you know, APPLIES COUPONS.
Remove apply_coupon_code from StoreController, as it appears that it's overriden in OrdersController

OrdersController seems to be the only place which uses it.
Added Regexp tab matching
Catch exceptions within Spree::Stock::Estimator#shipping_methods and log them

Fixes #4227

Conflicts:
	core/app/models/spree/stock/estimator.rb
Import variables using full-path, so that an overridden file in the application will be loaded

Fixes #3415
Show advice to run bundle exec rake test_app if dummy/config/environment fails to load
Added missing index for variant_id and currency on spree_prices

Fixes #4232
Use pure delegate in Spree::Gateway, compared with delegate_belongs_to

The provider method here is not a belongs_to association, so there's no good reason why we should be using delegate_belongs_to at all. Further more, delegate_belongs_to defines setters for these methods, but that is not necessary at all since these methods do not have setters!
Improved tracking URL generation to handle spaces in tracking numbers

Fixes #4233
Added nuance to shipping rate estimator Now distinguishing between $0 rates (possibly valid) and nil rates which could result in a huge loss to a store in a case where a $1000 shipping fee is reported as a nil by a bad calculator.

Also added an order-level model error message when no eligible
shipping rate is found.

Fixes #4239
Bump to Rails 3.2.16 in README
Bump to 2.0.8
Do not care if frontend/backend/api cannot be loaded in extensions
Fixes an issue where entering 30.49 would preauthorize 3049$
Merge commit 'fcfc8465223f932365588a36ba83a89d20fa4f99' into 2-0-stable

* commit 'fcfc8465223f932365588a36ba83a89d20fa4f99':
  Do not care if frontend/backend/api cannot be loaded in extensions
  Bump to 2.0.8
  Bump to Rails 3.2.16 in README
  Added nuance to shipping rate estimator Now distinguishing between $0 rates (possibly valid) and nil rates which could result in a huge loss to a store in a case where a $1000 shipping fee is reported as a nil by a bad calculator.
  Improved tracking URL generation to handle spaces in tracking numbers
  Use pure delegate in Spree::Gateway, compared with delegate_belongs_to
  Added missing index for variant_id and currency on spree_prices
  Show advice to run bundle exec rake test_app if dummy/config/environment fails to load
  Import variables using full-path, so that an overridden file in the application will be loaded
  Catch exceptions within Spree::Stock::Estimator#shipping_methods and log them
  Added Regexp tab matching
  Remove apply_coupon_code from StoreController, as it appears that it's overriden in OrdersController
  Ensure Coupon Applicator actually, you know, APPLIES COUPONS.
  Deleted shipping methods are now accessible from a shipping rate
  Update changelogs