Feature/multisite support

[hadamlenz]

add multisite support by using wp_get_upload_dir() so that code snippets are not shared across multisite sub-sites. Is backward compatible for single sites

[codeby]

I totally agree. There is a great lack of Multisite support.

[hadamlenz]

also, to add multisite support isn't that big of a deal, it seems

[Ericmuc]

Yes, that would be great if this feature could be added to the core in a future update.