Detect npm >=3.9.2 and adjust the install command accordingly

npm v3.9.1 included a fix for the bug which makes the `rm -rf
node_modules` necessary ( npm/npm#12372 ), but
also exposed a different bug which was fixed in npm v3.9.2
( npm/npm#12724 )

lib/reporter.js

@@ -1,16 +1,32 @@
 'use strict';
+var versionChecker = require('./version-checker');
 
 function installCommand(type) {
   switch (type) {
   case 'npm':
     return 'npm install';
   case 'npm-shrinkwrap':
+    // npm v3.9.1 included a fix for the bug which makes the rm -rf node_modules
+    // necessary ( https://github.com/npm/npm/issues/12372 ), but also exposed
+    // a different bug which was fixed in npm v3.9.2
+    // ( https://github.com/npm/npm/pull/12724 )
+    if (versionChecker.satisfies('>=3.9.2', getNpmVersion())) {
+      return 'npm install';
+    }
     return 'rm -rf node_modules/ && npm install';
   case 'bower':
     return 'bower install';
   }
 }
 
+function getNpmVersion() {
+  try {
+    return require('child_process').execSync('npm -v').toString();
+  } catch (e) {
+  }
+  return undefined;
+}
+
 var Reporter = function() {
   this.messages = [];
 };