[s3] small fixes related to versioning

lib/fog/aws/requests/s3/get_bucket_object_versions.rb

@@ -53,7 +53,7 @@ module Fog
           unless bucket_name
             raise ArgumentError.new('bucket_name is required')
           end
-          query = ''
+          query = 'versions&'
           for key, value in options
             query << "#{key}=#{CGI.escape(value.to_s).gsub(/\+/, '%20')}&"
           end

lib/fog/aws/s3.rb

@@ -208,7 +208,7 @@ DATA
             canonical_resource << "#{CGI.escape(subdomain).downcase}/"
           end
           canonical_resource << "#{params[:path]}"
-          if ['acl', 'location', 'logging', 'requestPayment', 'torrent', 'versioning'].include?(params[:query])
+          if ['acl', 'location', 'logging', 'requestPayment', 'torrent', 'versions', 'versioning'].include?(params[:query])
             canonical_resource << "?#{params[:query]}"
           end
           string_to_sign << "#{canonical_resource}"