supply version info to docs processors

scripts/docs/processors/index-page.js

@@ -1,18 +1,18 @@
-module.exports = function indexPage() {
+module.exports = function indexPage(renderDocsProcessor) {
   return {
     name: 'index-page',
     description: 'Create documentation index page',
-    version: 'nightly',
     $runAfter: ['adding-extra-docs'],
     $runBefore: ['extra-docs-added'],
     $process: function(docs) {
-      //TODO(tlancina): inject api base path or at least version
+      var currentVersion = renderDocsProcessor.extraData.version.current.name;
+
       docs.push({
         docType: 'index-page',
         id: 'index-page',
-        currentVersion: this.version,
+        currentVersion: currentVersion,
         template: 'api_index.template.html',
-        outputPath: 'docs/2.0.0-alpha.2/api/index.md'
+        outputPath: 'docs/' + currentVersion + '/api/index.md'
       });
     }
   }