Add apply_filters to edd_purchase_variable_pricing()

Added apply_filters to edd_purchase_variable_pricing() function tp allow extra content to be added after each variable priced download
move list items outside of printf
Merge remote-tracking branch 'origin/master'

Conflicts:
	includes/template-functions.php
move list items outside of printf
Merge pull request #1036 from sumobi/master

Added apply_filters to edd_purchase_variable_pricing