Add %%js alias for %%javascript

IPython/core/magics/display.py

@@ -31,6 +31,11 b' class DisplayMagics(Magics):'
     """
     
     @cell_magic
+    def js(self, line, cell):
+        """Run the cell block of Javascript code"""
+        self.javascript(line, cell)
+
+    @cell_magic
     def javascript(self, line, cell):
         """Run the cell block of Javascript code"""
         display(Javascript(cell))