Adding actions required for shipping details.

Have added the actions required so that they can be called from within
the shipping details plugin to display the tracking info. Which without
these actions requires editing the files every time there is a jigoshop
update.
Merge pull request #771 from patsatech/dev

Adding actions required for shipping details.
Added hooks for admin attributes actions
Merge pull request #774 from annzaan/attributes-admin-hooks

Added hooks for admin attributes actions
update for version 1.5
Update to sale shortcode for sales between dates 

Unless I've completely misunderstood, the [sale_products] shortcode was broken for sales between dates. 

The 'sale_price_dates_from' and 'sale_price_dates_to' are saved as timestamps in the database, but compared with a regular date, plus the compare operator was wrong for 'sale_price_dates_to'.

I noticed the problem on a site I run, where the [sale_products] would keep showing products after the sale was over, but with the original price. This is how I changed the code there, and it seems to work fine.
Merge pull request #775 from frompton/patch-2

Update to sale shortcode for sales between dates
update for version 1.5.1
Updated Ukrainian tanslation
fix for price including tax information saved in order data
Merge pull request #776 from annzaan/fix_for_taxes

fix for price including tax information saved in order data
Update classes/jigoshop_order.class.php

For translation
Update assets/css/select2.css

Texte non lisible
Merge pull request #777 from ThemesWpFr/patch-1

Update classes/jigoshop_order.class.php
Added filters for order/item prices in reports (need for Multi Currency)
Merge remote-tracking branch 'upstream/dev' into dev
Spell checked the translation
Added default attributes for variable products
Updated pt_BR Localization
Merge pull request #781 from sakhnik/dev

Updated Ukrainian translation to the HEAD