Prefix always end with a dot (.)

[code-and-such]

If I use setPrefixto set the prefix 'mu-stuff-' my local storage keys will get the name mu-stuff-.key. I need this to keep compatibility with the old local storage solution we used (ngStorage) which uses 'ngStorage-' as prefix.

I think I can do a workaround by looking for the old ones during startup and change their name, but it will require me to understand the local storage mechanism without any abstractions.