Fix support for --file-path

Closes GH-22.

Author: wooorm

lib/options.js

@@ -61,6 +61,7 @@ function options(flags, configuration) {
     help: config.help,
     version: config.version,
     files: config._,
+    filePath: config.filePath,
     watch: config.watch,
     extensions: ext.length === 0 ? configuration.extensions : ext,
     output: config.output,