added pump and sink

.gitignore

 images/*
 tags
+*.swp

src/Pump.java

+package nloc;
+
+public class Pump extends Channel {
+
+  public Pump () {
+    super(0,0);
+    super.addParent(null);
+  }
+
+  public void addParent(Channel parent) {
+    System.out.println("Can't add parent to Pump!");
+  }
+}

src/Sink.java

+package nloc;
+
+public class Sink extends Channel {
+
+  public Sink () {
+    super(0,0);
+    super.addChild(null);
+  }
+
+  public void addChild(Channel parent) {
+    System.out.println("Can't add Child to Sink!");
+  }
+}

src/TeeIntersection.java

@@ -13,12 +13,12 @@ public class TeeIntersection extends NlocEntity {
     this.inChans = new ArrayList<Channel>();
   }
 
-  public Channel getOutChan() {
-    return inChan;
+  public List<Channel> getInChans() {
+    return inChans;
   }
 
-  public List<Channel> getInChans() {
-    return outChans;
+  public Channel getOutChan() {
+    return outChan;
   }
 
   public void addInChan(Channel inChan) {