DOC: Add annotations file for answer key.

Currently, just provide a way to render to some of the data extracted.
Intended to have more thorough documentation of the spreadsheet,
explaining derivation/calculations in each sheet and column.

tests/risk/AnswerKeyAnnotations.ipynb

@@ -0,0 +1,87 @@
+{
+ "metadata": {
+  "name": "AnswerKeyAnnotations"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#\n",
+      "# Copyright 2013 Quantopian, Inc.\n",
+      "#\n",
+      "# Licensed under the Apache License, Version 2.0 (the \"License\");\n",
+      "# you may not use this file except in compliance with the License.\n",
+      "# You may obtain a copy of the License at\n",
+      "#\n",
+      "#     http://www.apache.org/licenses/LICENSE-2.0\n",
+      "#\n",
+      "# Unless required by applicable law or agreed to in writing, software\n",
+      "# distributed under the License is distributed on an \"AS IS\" BASIS,\n",
+      "# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n",
+      "# See the License for the specific language governing permissions and\n",
+      "# limitations under the License."
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "%load_ext autoreload\n",
+      "%autoreload 2"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import datetime\n",
+      "import pandas as pd\n",
+      "from IPython.display import HTML\n",
+      "\n",
+      "import answer_key\n",
+      "ANSWER_KEY = answer_key.ANSWER_KEY"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "print 'Period Returns Index'\n",
+      "print ANSWER_KEY.RETURNS"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "HTML(answer_key.RETURNS_DATA.to_html())"
+     ],
+     "language": "python",
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "ANSWER_KEY.ALGORITHM_CUMULATIVE_SHARPE"
+     ],
+     "language": "python",
+     "outputs": []
+    }
+   ]
+  }
+ ]
+}