Merge pull request #21 from wangleiTT/master

Fix rotate bug when array is not your example array "@[@1, @2, @3, @4]".

NSArray+rotate.m

@@ -9,7 +9,7 @@ @implementation NSArray (YOLORotate)
     return ^(NSInteger pivot) {
         if (pivot < 0)
             pivot = (int)self.count + pivot;
-        return self.skip(pivot).concat(self.snip(pivot));
+        return self.skip(pivot).concat(self.snip(self.count - pivot));
     };
 }