Add include
First version of EDD_Email_Template_Tags
Removed print_r
Added include
Moved default tags to separate file
Added all default tags with placeholders
Added email tags name, fullname, username
Updated future version
Created edd_get_email_names

Created edd_get_email_names so email name logic is defined at one place
Added user_email
Added date
Updated some PHP documentation
Added correct name description
Added tax
Added price
tax phpdoc
price phpdoc
Added receipt_id
Added payment_method
Added sitename