pix, deg, cm, norm unit types supported

- mouse supports pix, deg, cm, norm unit types (win32 tested; need to
test other OS's)
- Tobii and SMI support pix, deg, cm, norm unit types, still need to do
EyeLink and Eyegaze.
- Restructured project layout and created initial setup.py (although it
fails to install with easy_install as of committing. ;(
- Improved how ioHub Display class cooperates with psychopy Monitor
config file.
- Addressed issues #69, #66, #67, #60, #29, #17