Added support for X-Forwarded-For-header

[destotelhorus]

Just in case you want to use the script behind a reverse proxy or https-gateway you can now uncomment one line to get (some) support for the X-Forwarded-For-header.

[rugk]

ZeroBin is not maintained anymore. You may want to have a look at the (fork and) successor PrivateBin, which can be found here: https://github.com/PrivateBin/PrivateBin/

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As for the PR it looks nice, but in PrivateBin you could make this a config option in the ini file, so server admins do not have to mess around with the PHP files.

[elrido]

Actually we already implemented this as a configurable option about a year ago.

[rugk]

All right, so this is already implemented there. So I'd just suggest you to switch to PrivateBin, @destotelhorus.