Avoid creation of extra local directory.

Author: Tim Pesce

lib/compiler.js

@@ -77,7 +77,7 @@ var compiler = {
     require.extensions['.tsx'] = empty
     tmpDir = options['cache-directory']
       ? path.resolve(options['cache-directory'])
-      : path.join(os.tmpdir(), fs.mkdtempSync('.ts-node'))
+      : fs.mkdtempSync(path.join(os.tmpdir(), '.ts-node'))
     var compilerOptions
     if (options['compilerOptions']) {
       try {