improve the official generator detection

Had to hardcode the list since it's impossible to detect as people keeps forking ours and not updating the `author` and `repository` fields in package.json... t(ಠ益ಠt)

Shouldn't matter though as we're not going to make any more official generators.

lib/routes/install.js

@@ -9,6 +9,26 @@ var npmKeyword = require('npm-keyword');
 var packageJson = require('package-json');
 var got = require('got');
 
+var OFFICIAL_GENERATORS = [
+  'generator-angular',
+  'generator-backbone',
+  'generator-bootstrap',
+  'generator-chrome-extension',
+  'generator-chromeapp',
+  'generator-commonjs',
+  'generator-generator',
+  'generator-gruntplugin',
+  'generator-gulp-webapp',
+  'generator-jasmine',
+  'generator-jquery',
+  'generator-karma',
+  'generator-mobile',
+  'generator-mocha',
+  'generator-node',
+  'generator-polymer',
+  'generator-webapp'
+];
+
 module.exports = function (app) {
   app.insight.track('yoyo', 'install');
 
@@ -76,22 +96,14 @@ function searchMatchingGenerators(app, term, cb) {
   });
 }
 
-function isYeomanPackage(pkg) {
-  if (pkg.author && pkg.author.name) {
-    return pkg.author.name.indexOf('Yeoman') !== -1;
-  }
-
-  return false;
-}
-
 function fetchGeneratorInfo(generator, cb) {
   packageJson(generator.name, function (err, pkg) {
     if (err) {
       cb(err);
       return;
     }
 
-    var official = isYeomanPackage(pkg);
+    var official = OFFICIAL_GENERATORS.indexOf(pkg.name) !== -1;
     var mustache = official ? chalk.green(' ' + figures.mustache + ' ') : '';
 
     cb(null, {