BF: avbin.dll WindowsError exception

Found a runtime condition that was resulting in the WindowsException:
Invalid Memory Address Access.

This patch fixes it.
BF: iohub SMI eyetracker file encoding

Was not setting the file encoding to utf-8 for the updated SMI eye
tracker files, so it was causing a crash on a persons system that was
not setup to use utf-8 as the default.
Merge branch 'master' of git://github.com/psychopy/psychopy
Revert "BF: avbin.dll WindowsError exception"

This reverts commit 01ed8bfe1b909be7a4c431d834c820c314239a19.
Merge pull request #517 from isolver/master

BF: WindowsError and File encoding issue