Spanish translation update

Spanish translation extended and improved.
Duplicate capability hook
+* Localization - Added a point to the symbol of the Russian currency
Add 'woocommerce_create_account_default_checked' for #3098
Merge pull request #3091 from Almaz/patch-2

Localization - Added a point to the symbol of the Russian currency.
Readme update for #3091
esc_js for translatable string in the javascripts
Merge pull request #3103 from kloon/master

esc_js translatable strings for the JS
Readme with #3103
esc_js translatable strings to avoid js breaking on quote chars
Merge pull request #3105 from kloon/master

esc_js ify WooCommerce
Update ro_RO frontend translations
Update public parameters for 'product_variation' and 'shop_coupon' CPTs

Update 'public' parameters for 'product_variation' and 'shop_coupon' to 'false' and update 'query_var' parameter for 'product_variation' to false.
Merge pull request #3111 from krogsgard/master

Update CPT parameters for 'product_variation' and 'shop_coupon'
Readme update with #3111
Updated the correct doc block for return type
PayPal button should use 'button' and 'alt' classes. Closes #3096
Updated the return doc block with a brief explanation of the return type.
gitignore
Have the remove_taxes() method set subtotal to subtotal_ex_tax