Merge pull request jiahuang#33 from wenzul/master

Set either beginning or ending

src/d3-timeline.js

@@ -68,7 +68,7 @@
 
       // check how many stacks we're gonna need
       // do this here so that we can draw the axis before the graph
-      if (stacked || (ending === 0 && beginning === 0)) {
+      if (stacked || ending === 0 || beginning === 0) {
         g.each(function (d, i) {
           d.forEach(function (datum, index) {
 
@@ -79,21 +79,23 @@
             }
 
             // figure out beginning and ending times if they are unspecified
-            if (ending === 0 && beginning === 0){
-              datum.times.forEach(function (time, i) {
+            datum.times.forEach(function (time, i) {
+              if(beginning === 0)
                 if (time.starting_time < minTime || (minTime === 0 && timeIsRelative === false))
                   minTime = time.starting_time;
+              if(ending === 0)
                 if (time.ending_time > maxTime)
                   maxTime = time.ending_time;
-              });
-            }
+            });
           });
         });
 
-        if (ending === 0 && beginning === 0) {
-          beginning = minTime;
+        if (ending === 0) {
           ending = maxTime;
         }
+        if (beginning === 0) {
+          beginning = minTime;
+        }
       }
 
       var scaleFactor = (1/(ending - beginning)) * (width - margin.left - margin.right);