Modified loopback_wrapper to look for terminators in read

Before, a size parameter of -1 would just dump the entire stdin buffer to the caller. Now it reads until a terminator, consistent with the other wrappers.
Added unit tests for Tek TDS224 oscilloscope
Update setup.py to include qubitekk
Merge pull request #36 from Galvant/dev

Pull new unit tests into feature branch.

Merging this in even though it's failing, as the whole point is to better diagnose failures.