Updating README & Removing global namespace option.

[sketchthat]

Updating README documentation to include required parameter of $url in Parser saveAttachments function.

Removing global namespace from Parser.php as it wasn't consistent with the rest of the function calls & isn't needed.

[eXorus]

Hello,

Where do you see that saveAttachments required URL ?

public function saveAttachments($attach_dir)

[sketchthat]

I grabbed the package through composer and it looks like it has a different version.

public function saveAttachments($attach_dir, $url)

Ignore my pull request, it isn't relevant in this version.