Python 2/3 compatible codebase
mv acrylamid/specs/ to tests/
new workaround the PYTHONHASHSEED issue

only temporarily, better use Adler-32 or something similar.
internal webserver now uses `.send_header` to revalidate, fixes #162

(issue only appeared on Python 3.3)
Merge branch 'feature/unify' Python 2/3 compatibility

EXPECT THINGS TO BREAK!