Major rewrite for RC1

With the release of Drupal Commerce RC1 I thought it was time to get the RC1 out as well.

I've done a major rewrite of the module, removing support for the old style shipping method implementation in favor of the ctools plugin type shipping method. The work in converting such a method is very limited, as you should be able to copy and paste the callback functions into a class implementing them instead.

During this effort of removing support for the old shipping method implementation I was able to remove a lot of code, making the module a more light weight and easier to maintain - Yay.

I've created update hooks that should take care of removing the old shipping method rules if you have any (these are useless now anyways), and some tweaks were needed to the existing plugin type rules, as the naming have been changed a bit. If you have settings you want to preserve from the old type rules you will need to copy it into the new ones you create before running the update function.

I have tested this but with limited data, so I would like to call out for users to test the upgrade and report any bugs or errors. If nothing blows up, I'll make a new release in a a few days.

In the last few days I've also rolled out a few new features, the latest i a shipping customer profile that can be used for shipping address and the ability for plugins to define their own price component that will be used for the shipping line items created by it.

To get an idea of the extent of the changes, you can see the diff of what I call the rewrite here: http://drupalcode.org/project/commerce_shipping.git/commitdiff/f7eae65?h...