Fix capitalization inconsistencies
#2017 - Allowing cart to be filtered while adding to cart
#2017 - Making filter match the function being used more closely
Merge pull request #2018 from cklosowski/master

Allowing cart to be filtered while adding to cart
Merge pull request #2016 from ghost1227/issue/1965

Fix capitalization issues
#2022 - Add sanity checks to item being added to cart
Allow filtering of From Name and Email Address

We would like to be able to filter the from name and email address for different product groups.
Fixed an AJAX tax bug

Probably caused by 7096294ccebb4cbd09365644ebc573991242bdf6

Taxes are calculated by ‘billing_country’ so all country vars that
influence tax calculation should be named ‘billing_country’
Small code style change
Merge pull request #2024 from jdevalk/patch-2

Allow filtering of From Name and Email Address
Merge pull request #2025 from barrykooij/bug/ajax-tax-bug

Fixed an AJAX tax bug
Merge pull request #2023 from cklosowski/master

Add sanity checks to item being added to cart