Checkout country lists will dynamically update to contain only allowed countries
Shipping country (calculator and checkout) will have only allowed countries
If shipping same as billing is visible and selected only allowed countries will be present in the list
removed a couple of unreferenced variables
if at time of upgrade base country is legacy UK ISO code fix it
Change to country id corresponding to GB
Merge pull request #1203 from JeffPyeBrook/pr-63-fix-base-country-empty

if at time of upgrade base country is legacy UK ISO code fix it
Merge pull request #1202 from JeffPyeBrook/pr-country-list-only-allowed

Checkout country lists will dynamically update to contain only allowed countries
Handle case where visitor meta stored in prior releases of WPeC was stored as an array rather than a singular value.
fixed array index
Validate shipping / billing country visitor meta
Does a check of the shipping/billing country meta to be sure that all meta values are stored as individual values rather than array
Make check for localized variable more specific and use a string for the returned type
Merge branch 'pr-visitor-meta-backwards-compatibility'