Upgraded cross-validation and created ToC link to evaluation

Table_of_Contents.ipynb

 {
  "metadata": {
   "name": "",
-  "signature": "sha256:02701b4647f4627969e1153bf3a0a52f55db3adcfa149e54f81fc4d27d65967b"
+  "signature": "sha256:536c517d48c98583d6306b6a68d4f93eed7dc8277f50f50aa7f338f8a2832ad9"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -107,14 +107,23 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
+      "1.  [Cross Validation](notebooks/cross_validation.ipynb)\n",
+      "1.  [Evaluation](notebooks/evaluation.ipynb)\n",
       "1.  [Tonal Descriptors: Pitch and Chroma](notebooks/tonal.ipynb)\n",
       "1.  [Feature Extraction](notebooks/feature_extraction.ipynb)\n",
       "1.  [Beat Tracking](notebooks/beat_tracking.ipynb)\n",
       "1.  [Tempo Estimation](notebooks/tempo_estimation.ipynb)\n",
       "1.  [Nonnegative Matrix Factorization](notebooks/nmf.ipynb)\n",
-      "1.  [Cross Validation](notebooks/cross_validation.ipynb)\n",
-      "1.  [Exercise: Source Separation using NMF](exercises/nmf_source_separation.ipynb)"
+      "1.  [Exercise: Source Separation using NMF](exercises/nmf_source_separation.ipynb)\n"
      ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
     }
    ],
    "metadata": {}