refactor(build): simplify and modularize

simplify:
- use same html file for dart and JS
- build benchmarks automatically when doing `gulp build`
- centralize configuration

modularize:
- move all build tasks into separate node.js modules under
  `tools/build`.

changes:
- the `build` folder is now the `dist` folder

Closes #284

docs/dgeni-package/index.js

@@ -45,7 +45,7 @@ module.exports = new Package('angular', [jsdocPackage, nunjucksPackage])
 
 // Configure file writing
 .config(function(writeFilesProcessor) {
-  writeFilesProcessor.outputFolder  = 'build/docs';
+  writeFilesProcessor.outputFolder  = 'dist/docs';
 })
 
 

docs/dgeni-package/services/atParser.js

@@ -1,6 +1,6 @@
 var traceur = require('traceur/src/node/traceur.js');
 var ParseTreeVisitor = System.get(System.map.traceur + '/src/syntax/ParseTreeVisitor').ParseTreeVisitor;
-var file2modulename = require('../../../file2modulename');
+var file2modulename = require('../../../tools/build/file2modulename');
 /**
  * Wrapper around traceur that can parse the contents of a file
  */