- documentation updates:

-- add Key module to index page
  -- include cross references for Object.colbits in material descriptions
     within Object, NMesh and Mesh modules

source/blender/python/api2_2x/doc/API_intro.py

@@ -23,6 +23,7 @@ The Blender Python API Reference
   - L{Effect}
   - L{Image}
   - L{Ipo}
+  - L{Key} (*)
   - L{Lamp}
   - L{Lattice}
   - L{Library}