server: seperation between production build dir and dev build dir: LiberviaRootResource instances's `build_path` is the path where generated files are put and served by the HTTP server, while `dev_buid_path` is used for temporary files/libraries needed for the generation/compilation of files.

import os.path

version_file = os.path.join(os.path.dirname(__file__), "VERSION")
try:
    with open(version_file) as f:
        __version__ = f.read().strip()
except NotImplementedError:
    # pyjamas workaround
    __version__ = "0.7.0D"