Merge pull request #7 from smathot/master

Some small tweaks to facilitate versioning
slight update on webcam example script
bugfixes event detection
added sample output
indentation is tab based again
bugfixes in event detection
some more bugfixes in event detection
added flushing option to Keyboard class' get_key
(re-)added pupil_size method to libeyelink
updated pupil_size
First pass at large restructuring
Bump to 0.5.0~pre1
Modularize `libtime`
Add quit on escape to to `simple_experiment.py`
Modularize `libsound`
Fix `import` statements
First rough pass at adding OpenSesame functionality
Remove extraneous print statements
Add proof-of-concept OpenSesame experiment that uses PyGaze
stablized large restructuring