cleanup: deletes unofficial Android support

because:
- it didn't work all that well
- using a cross-chicken and compiling as a normal egg is much better
cleanup: removes old version information

todo: make the original macros accessible from scheme?
vcs: ignoring glut-sandbox build-files
refac: moves samples into separate directory

trying to stay tidy here! these files are not part of acorn, but are
probably quite essential to get anything useful out of it ..
samples: adds acorn-draw example (uses sdl and gl eggs)
callback wip: allow nesting queries on some functions

with this patch, you can nest chipmunk functions which have callbacks.
eg. (space-for-each-body space (lambda (shape) (body-for-each-shape
body (lambda a (print a)))))

todo:
- handle exceptions inside callbacks
- use the new callbacks on all functions