Add class to unlimited file downloads

Make it easy to hide via CSS
Merge pull request #2365 from elliott-stocks/patch-1

Add class to unlimited file downloads
Rework edd_purchase_form_validate_gateway() to prevent errors being set regarding gateways. Gateway errors are kind of silly. It's better to just fallback to the default gateway. #2367
Merge branch 'master' of github.com:easydigitaldownloads/Easy-Digital-Downloads
Use edd_get_payment_number() in get_recent_sales(). Closes #2366
Version 2.0.2 bump and changelog
Pass current_time( 'timestamp' ) to date() when setting up purchase data
Check that download has variable prices before checking for file conditions