base_country js param for order tax calculation

added  woocommerce_writepanel_params.base_country to fix tax
calculation when an order is created manually. if you click the button
calc taxes the js uses base_country to calc when no billing/shipping
country is selected. just like the the message says: "If no
billing/shipping is set it will use the store base country".
Updated it_IT
Merge pull request #2965 from Marco-G/master

Updated it_IT
Update ro_RO

frontend - 83% (not translated all the countries and currencies)
backend - 95%
Remove url params from filenames on orders in backend under Downloadable Product Permissions
Removed space
Update class-wc-gateway-bacs.php

Make bank detail labels filterable in BACS admin
Norwegian updates by Tore Hjartland
Spanish updates by Laguna Sanchez
Revert "Update class-wc-gateway-bacs.php"

This reverts commit cc8e4960feb5ea73de28a208dd39e51de2fa7da2.
Fix undefined found shipping classes. Closes #2974.
Merge pull request #2969 from a1ur3l/master

update ro_RO translation
Merge pull request #2971 from kloon/master

Remove url params from orders under Downloadable Product Permissions meta box
readme
Use the core function #2971
Merge pull request #2968 from piffpaffpuff/master

use base_country for tax calculations in manually created orders
readme and minify
filter allowed countries/states
Fix saving options for attribute taxonomies containing special chars. Closes #2975.
Less fugly conditonal.