add Reducer and change PositionWritable to PositionListWritable in NodeWritable
diff --git a/genomix/genomix-hadoop/data/webmap/test.txt b/genomix/genomix-hadoop/data/webmap/test.txt
new file mode 100644
index 0000000..17770fa
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/test.txt
@@ -0,0 +1 @@
+1	AATAGAAG