Merge pull request #46 from JDutil/2-2-wip

Spree 2.2.x updates but still calculates on order rather than line items...
Ensure adjustment always created with transaction
Merge pull request #58 from bbuchalter/master

Ensure adjustment always created with transaction
rename taxcloud_product_tic to taxcloud_default_product_tic
add product-level TICs
update README to reflect product-level TIC feature development
Merge pull request #62 from brchristian/product_tics_master

Product TICs for master branch
Merge branch 'master' into 2-2-stable