remove comments from structured headers when looking for email addresses

Resolves #112

lib/postal/helpers.rb

@@ -3,7 +3,7 @@ module Postal
 
     def self.strip_name_from_address(address)
       return nil if address.nil?
-      address.gsub(/.*</, '').gsub(/>.*/, '').strip
+      address.gsub(/.*</, '').gsub(/>.*/, '').gsub(/\(.+?\)/, '').strip
     end
 
   end