Added lmnn doc page

Author: terrytangyuan

doc/source/index.rst

@@ -12,7 +12,7 @@ Contents:
    :maxdepth: 2
 
    intro
-   
+   lmnn
 
 
 

doc/source/lmnn.rst

@@ -0,0 +1,18 @@
+Large Margin Nearest Neighbor (LMNN)
+=====================================
+
+todo: Brief desciption or a link.
+
+Example Code
+=====================================
+Using two different implementations:
+
+::
+
+	for LMNN_cls in set((LMNN, python_LMNN)):
+	      lmnn = LMNN_cls(k=k, learn_rate=1e-6)
+	      lmnn.fit(self.iris_points, self.iris_labels, verbose=False)
+
+	      csep = class_separation(lmnn.transform(), self.iris_labels)
+	      self.assertLess(csep, 0.25)
+