Make fp tests browser runnable.

lib/fp/build.js

@@ -30,7 +30,7 @@ var mappingConfig = {
   'entry': path.join(__dirname, 'mapping.js'),
   'output': {
     'path': distPath,
-    'filename': 'fp-mapping.js',
+    'filename': 'mapping.fp.js',
     'library': 'mapping',
     'libraryTarget': 'umd'
   }