Add support for yarn linked generators

Closes yeoman/generator#1032

Author: appsforartists

lib/resolver.js

@@ -1,6 +1,7 @@
 'use strict';
 const path = require('path');
 const fs = require('fs');
+const os = require('os');
 const _ = require('lodash');
 const globby = require('globby');
 const debug = require('debug')('yeoman:environment');
@@ -131,6 +132,13 @@ resolver.getNpmPaths = function () {
   paths.push(path.join(__dirname, '../../../..'));
   paths.push(path.join(__dirname, '../..'));
 
+  // Yarn's file structure looks like this:
+  //
+  //   ~/.config/yarn/global/node_modules/yo/
+  //   ~/.config/yarn/link/generator-i-made
+  //
+  paths.push(path.join(os.homedir(), '.config/yarn/link/'));
+
   // Adds support for generator resolving when yeoman-generator has been linked
   if (process.argv[1]) {
     paths.push(path.join(path.dirname(process.argv[1]), '../..'));