Update gi_gpib.py to assign _eos on init
Reorder GPIBWrapper __init__ content

We were checking contents of _version prior to actually writing it.
Fix packages parameter in setup

This was passing in automatic builds but was apparently actually a problem.
Merge pull request #45 from dijkstrw/dev

Merge HP3456a from dijkstrw
Bugfix: Keithley580 do not parse terminator

Do not look for the terminator in the parse functions, as this is stripped
already in the class specific query function.