Merge pull request #1647 from fxbenard/master

[i18n]> pot updated, all .mo updated, all .po removed
fix test_addition_of_discount() test
Fixed improper edd_currency_filter() closing in heartbeat_received()
Merge pull request #1648 from ghost1227/bugs/1643

Fixed improper edd_currency_filter() closing in heartbeat_received()
Fix bug in payment method icon urls
Remove debugging echo/add multisite support
Removed unneeded multisite check... learn something new every day!
Merge pull request #1649 from ghost1227/bugs/1642

Bugs/1642
Fix catchable fatal error in payment history. #1651
Merge branch 'master' of github.com:easydigitaldownloads/Easy-Digital-Downloads
Alloq quantity to be passed in the  array for edd_add_to_cart()
Merge branch 'master' of github.com:easydigitaldownloads/Easy-Digital-Downloads
Fix PHPDoc @return for edd_insert_payment (it's int|bool, not bool)
Merge pull request #1652 from sc0ttkclark/patch-1

Fix PHPDoc @return for edd_insert_payment (it's int|bool, not bool)
Introduce edd_override_edit_post_for_payment_link() to rewrite edit post URLs for EDD payments to the View Order Details screen
Ensure all user address keys are set. CLoses #1641
Set email width to 660px. Closes #1655
add edd_download_files filter
Improve missing .htaccess warning
Merge pull request #1661 from ghost1227/bugs/1657

Improve missing .htaccess warning