chore: don't shred _boilerplate files nor dart build files (#2747)

Author: chalin

gulpfile.js

@@ -808,7 +808,7 @@ gulp.task('_harp-compile', function() {
 
 gulp.task('_shred-devguide-examples', ['_shred-clean-devguide', '_copy-example-boilerplate'], function() {
   // Split big shredding task into partials 2016-06-14
-  var examplePaths = globby.sync(EXAMPLES_PATH+'/*/', {ignore: ['/node_modules']});
+  var examplePaths = globby.sync(EXAMPLES_PATH+'/*/', {ignore: ['**/node_modules', '**/_boilerplate']});
   var promise = Promise.resolve(true);
   examplePaths.forEach(function (examplePath) {
     promise = promise.then(() => docShredder.shredSingleExampleDir(_devguideShredOptions, examplePath));

tools/doc-shredder/doc-shredder.js

@@ -4,7 +4,7 @@ var del = require('del');
 var Dgeni = require('dgeni');
 var _ = require('lodash');
 var globby = require('globby');
-var ignoreDirs = ['**/node_modules/**', '**/dist/**'];
+var ignoreDirs = ['**/node_modules/**', '**/dist/**', '**/dart/**/build/**', '**/.pub/**'];
 
 var _getLogLevel = function (options) { return options.logLevel || 'info'; }