Catch errors with frame loading

lib/horseman/dom/document.rb

@@ -65,8 +65,13 @@ def parse!(body)
 	      end
 
 	      doc.css('frame').select{|f| f.attr('src') && f.attr('name')}.each do |f|
-	      	frame_body = open(f.attr('src')) {|f| f.read.strip}
-	      	@frames[f.attr('name').to_sym] = Document.new(frame_body)
+	      	frame_src = f.attr('src')
+	      	begin
+	      		frame_body = open(frame_src) {|f| f.read.strip}
+	      		@frames[f.attr('name').to_sym] = Document.new(frame_body)
+	      	rescue
+	      		puts "Could not load frame at #{frame_src}"
+	      	end
 	      end
 
 	      @dom = doc