Support NVM node-modules (yeoman#87)

Author: mseada94

lib/resolver.js

@@ -7,6 +7,7 @@ const globby = require('globby');
 const debug = require('debug')('yeoman:environment');
 
 const win32 = process.platform === 'win32';
+const nvm = process.env.NVM_HOME;
 
 /**
  * @mixin
@@ -108,7 +109,9 @@ resolver.getNpmPaths = function () {
   let paths = [];
 
   // Default paths for each system
-  if (win32) {
+  if (nvm) {
+    paths.push(path.join(process.env.NVM_HOME, process.version, 'node_modules'));
+  } else if (win32) {
     paths.push(path.join(process.env.APPDATA, 'npm/node_modules'));
   } else {
     paths.push('/usr/lib/node_modules');