Add utility class for timer package.

src/com/garbagemule/MobArena/util/timer/Common.java

@@ -0,0 +1,23 @@
+package com.garbagemule.MobArena.util.timer;
+
+public class Common {
+    /**
+     * Convert seconds to ticks.
+     *
+     * @param seconds value to convert
+     * @return the value converted to ticks
+     */
+    public static long toTicks(int seconds) {
+        return seconds * 20l;
+    }
+
+    /**
+     * Convert ticks to seconds.
+     *
+     * @param ticks value to convert
+     * @return the value converted to seconds
+     */
+    public static int toSeconds(long ticks) {
+        return (int) (ticks / 20l);
+    }
+}