Minor fix in OSDisplay
Do not import all modules in `pygaze.__init__()` to avoid trouble with setting defaults
Accept keyword-argument dictionary in libsmi and libtobii to avoid non-matching arguments
Further fixes to EyeLink functionality
Further fixes to OpenSesame plug-ins
Fix clock imports
Fix incorrect reference to Screen in DumbDummy
Add draw_target option to pygaze_drift_correct OpenSesame plug-in
Merge pull request #12 from smathot/master

Further fixes and improvements to OpenSesame plug-ins and EyeLink functionality