Added a setTime(long) to Calendars.Builder.

src/main/java/com/samskivert/util/Calendars.java

@@ -87,6 +87,12 @@ public class Calendars
             return this;
         }
 
+        /** See {@link Calendar#setTimeInMillis}. */
+        public Builder setTime (long millis) {
+            _calendar.setTimeInMillis(millis);
+            return this;
+        }
+
         /** Sets the time to zero milliseconds after midnight on the specified year, month and
          * day. This mirrors {@link Calendars#at} for when you need e.g. a custom timezone:
          * <pre>Calendars.in(zone).at(2009, Calendar.JANUARY, 1)</pre> */