Globally register components example (#1959)

* Automatic Global Registration of Base Components example did not work if you wanted to include subfolders. This solution has been tested and confirmed. https://stackoverflow.com/questions/53676837/registering-components-globally-in-vuejs-in-subfolders/53678945#53678945

* Updated regex in global compnent registration code example to allow setting subfolder to true

Author: twickstrom

src/v2/guide/components-registration.md

@@ -207,11 +207,15 @@ requireComponent.keys().forEach(fileName => {
   // Get PascalCase name of component
   const componentName = upperFirst(
     camelCase(
-      // Strip the leading `./` and extension from the filename
-      fileName.replace(/^\.\/(.*)\.\w+$/, '$1')
+      // Gets the file name regardless of folder depth
+      fileName
+        .split('/')
+        .pop()
+        .replace(/\.\w+$/, '')
     )
   )
 
+
   // Register component globally
   Vue.component(
     componentName,