option "links='true'" to generate links in the {{dirTree}}-helper

- The dirTree-helper can now generate links that point to the
  listed files in the github repository. The option `links='true'`
  can be used to activate this behavior.
- Links are only generated for files matching the glob-pattern,
  not for intermediate nodes that are implicitely created.

.thought/templates/docs/helpers.md.hbs

@@ -2,5 +2,5 @@
 
 The following helpers are built-in for use in templates and partials
 
-{{jsdoc 'handlebars/helpers.js'}}
+{{jsdoc 'handlebars/helpers/*.js' }}
 

customize.js

@@ -46,7 +46,7 @@ module.exports = function createSpec (workingDir) {
         handlebars: {
           partials: path.join(__dirname, 'handlebars', 'partials'),
           templates: path.join(__dirname, 'handlebars', 'templates'),
-          helpers: require.resolve('./handlebars/helpers.js'),
+          helpers: require.resolve('./handlebars/helpers/index.js'),
           data: {
             'package': require(path.resolve(workingDir, 'package.json')),
             config: config,