VISA wrapper for Julia

Bare-bones Julia wrapper for VISA libraries, using C calls. Tested with the NI-VISA library.

Pulled out of BBN-Q/Instruments.jl into a self-contained module.

Installation

Download and install the NI-VISA libraries.

Pkg.clone("https://github.com/PainterQubits/VISA.jl.git")
Pkg.build("VISA")