util.encodings: Don't throw an error but return nil when passed nil or a non-string value

Merge with 0.5

util.pposix: Compatibility with Solaris systems (thanks Filip)

util.signal: Change ifdef to allow signal.kill() on Solaris (thanks Filip)

Makefile: Don't combine variable export with assignment for compatibility with other shells (thanks Filip)

Merge with 0.5

Tagging 0.5.2

Merge with trunk

MUC: Added multi-session support to the room-exiting occupant use case.

MUC: Renamed a variable name.

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