chore(doc-gen): generate docs for angular.io

You can generate docs for comsumption by the angular.io website by running:

```bash
gulp docs/angular.io
```

The generated docs can be found in `dist/angular.io`

docs/angular.io-package/processors/addJadeDataDocsProcessor.js

@@ -0,0 +1,75 @@
+var _ = require('lodash');
+var path = require('canonical-path');
+
+var titleCase = function(text) {
+  return text.replace(/(.)(.*)/, function(_, first, rest) {
+    return first.toUpperCase() + rest;
+  });
+};
+
+/*
+* Create _data.json file for Harp pages
+*
+* http://harpjs.com/docs/development/metadata
+*
+* This method creates the meta data required for each page
+* such as the title, description, etc. This meta data is used
+* in the harp static site generator to create the title for headers
+* and the navigation used in the API docs
+*
+*/
+
+module.exports = function addJadeDataDocsProcessor(EXPORT_DOC_TYPES) {
+  return {
+    $runAfter: ['adding-extra-docs', 'cloneExportedFromDocs'],
+    $runBefore: ['extra-docs-added'],
+    $process: function(docs) {
+      var extraDocs = [];
+      var modules = [];
+
+
+      /*
+      * Create Data for Modules
+      *
+      * Modules must be public and have content
+      */
+
+      _.forEach(docs, function(doc) {
+        if (doc.docType === 'module' && doc.exports.length) {
+          modules.push(doc);
+
+          // GET DATA FOR INDEX PAGE OF MODULE SECTION
+          var indexPageInfo = [{
+            name: 'index',
+            title: _.map(path.basename(doc.fileInfo.baseName).split('_'), function(part) {
+              return titleCase(part);
+            }).join(' '),
+            intro: doc.description.replace('"', '\"').replace(/\r?\n|\r/g,"")
+          }];
+
+          // GET DATA FOR EACH PAGE (CLASS, VARS, FUNCTIONS)
+          var modulePageInfo  = _.map(doc.exports, function(exportDoc) {
+            return {
+              name: exportDoc.name + '-' + exportDoc.docType,
+              title: exportDoc.name + ' ' + titleCase(exportDoc.docType)
+            };
+          });
+
+          //COMBINE PAGE DATA
+          var allPageData = indexPageInfo.concat(modulePageInfo);
+
+          // PUSH DATA TO EXTRA DOCS ARRAY
+          extraDocs.push({
+            id: doc.id + "-data",
+            docType: 'jade-data',
+            originalDoc: doc,
+            data: allPageData
+          });
+        }
+      });
+
+
+      return docs.concat(extraDocs);
+    }
+  };
+};