Expyriment

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New Features:
- Overall structure has changed quite a bit. There are now only 5 submodules
(control, design, io, stimuli, misc). Things like initialize() and start()
are now in control. Constants are now in misc. Each module has its own
defaults now.
Changed:
- Adding blocks and trexpyrimentials will always add a copy. There is no option
for adding a reference anymore.
- Block and Trial IDs are now relative to where they are added. For instance,
two blocks can contain 10 unique trials each, but for both blocks the trial
IDs will go from 0 to 9.
- Adding stimuli will always add a reference!
- Stimuli have still an absolute unique ID
Fixed:
- A variety of small bugs have been fixed

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Fixed:
- Getting a picture from a stimulus was broken

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Fixed:
- Tempfiles of surfaces are now closed after creation (critical on Windows!)

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Changed:
- expyriment version now printed on import, not on Experiment creation anymore
Fixed:
- Setup script will not try to check mercurial information by default anymore

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New Features:
- Throws a useful exception on old or integrated Intel graphics cards that
do not support OpenGL properly
Fixed:
- Experiment.permute_blocks() will not destroy the surfaces of the
stimuli anymore

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First public release