[WIP] Gpib events#175

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tivek wants to merge 10 commits intopyvisa:mainfrom

tivek:GPIB-events

Commits on Dec 3, 2018

Commits on Dec 5, 2018

fix timeout bugs in GPIBSession.wait_on_event()
tivek
committed

Commits on Dec 6, 2018

Commits on Dec 7, 2018

remove mechanism check from Session
tivek
committed

Commits on Dec 9, 2018

add a simple GPIBEvent class
tivek
committed

Commits on Dec 10, 2018

set basic GPIBEvent attributes
tivek
committed

Commits on Dec 12, 2018

introduce a generic EventData class
tivek
committed