Concatenated files aren't concatenated safely

[nolanlawson]

I think to be 100% safe, you need to concatenate files with ;\n, yes? Currently it looks like this only concatenates with \n.

Prompted by pouchdb-community/pouchdb-authentication#17.

[yocontra]

@nolanlawson This module is for all types of files, not just JS. If you want to concat with ;\n then you can do so with the newLine option