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
Change "Purchase" to "Download" on Free Purchases
slight modification to match new github code
removed double ternary
Add fallback for item_number
Add Billing Details to top of billing fields
Fix typo
Fix problem with cart fees over writing cart items in PayPal
Allow tax rates to be country-wide. #1260
Merge branch 'master' of github.com:easydigitaldownloads/Easy-Digital-Downloads
added two new actions to checkout template
Merge pull request #1255 from Studio164a/master

Add a filter for the templates directory.
Merge pull request #1254 from sumobi/master

Change "Purchase" to "Download" on Free Purchases
Hide tax billing fields if purchase total is 0.00. Closes #1252
Only add edd_before/after_download_content actions on singular download post type. Closes #1148
Fixed missing tax display
Updated version number and changelog
Corrected changelog date