Merge pull request #11 from smathot/master

Various fixes, mostly to EyeLink functionality
Merge pull request #12 from smathot/master

Further fixes and improvements to OpenSesame plug-ins and EyeLink functionality
Merge pull request #15 from smathot/master

Updates to EyeLink functionality and OpenSesame plug-ins
Update README.md
EyeLink: Use system-dependent image-array format
- Avoids scrambled camera image on 64 bit linux
Eyelink: Improve camera image
- Performance improvement
- Draw pupil circle
- Draw image title