Add script to run all days

tools/run_all.rb

@@ -0,0 +1,18 @@
+
+days_dir = File.join(File.expand_path("."), 'days', '')
+
+total_time = 0
+
+Dir["#{days_dir}day*.rb"].each do |file|
+	day = file.match(/day(\d\d)\.rb/)
+	next unless day
+
+	day = day[1].to_i
+	if day > 0 and day < 26
+		start = Time.now
+		require file
+		total_time += (Time.now-start)
+	end
+end
+
+puts "\nTotal runtime:\t#{total_time}s"