Fix [download_discounts] invalid argument warning.

An invalid argument supplied warning is thrown when there are no
discounts.
Fix empty [download_discounts] invalid argument warning.
Added missing textdomain
Corrected changelog date
Merge pull request #1234 from ChillThemes/master

Fix [download_discounts] invalid argument warning.
Correct [download_discounts] short code error
Merge branch 'master' of git://github.com/easydigitaldownloads/Easy-Digital-Downloads
Sort countries by name, not abbreviation!
Merge pull request #1263 from ghost1227/master

Sort countries correctly!
remove unused var
Fixed bug with default taxes not working for some countries
Update register-settings.php
Update register-settings.php
Add message param to wp_die() in edd_die()
Updated German translations for v1.6.2 :-)
Fix problem with 100% discount codes going to PayPal. Closes #1268
Add Dan @ghost1227 as a onctributor. Closes #1267
Merge pull request #1265 from deckerweb/master

Updated German translations for EDD v1.6.2
updated version to 1.6.3
Updated readme