api-builder: replace underscores from jade filenames

Closes angular#2184

Author: petebacondarwin

tools/api-builder/angular.io-package/index.js

@@ -114,8 +114,8 @@ module.exports = new Package('angular.io', [basePackage, targetPackage, cheatshe
 
   computePathsProcessor.pathTemplates.push({
     docTypes: EXPORT_DOC_TYPES,
-    pathTemplate: '${moduleDoc.moduleFolder}/${name}-${docType}.html',
-    outputPathTemplate:'${moduleDoc.moduleFolder}/${name}-${docType}.jade',
+    getPath: function(doc) { return doc.moduleDoc.moduleFolder + '/' + doc.name.replace(/^_+/, '-') + '-' + doc.docType + '.html'; },
+    getOutputPath: function(doc) { return doc.moduleDoc.moduleFolder + '/' + doc.name.replace(/^_+/, '-') + '-' + doc.docType + '.jade'; }
   });