Fix 204 responses, hangs and crashes with REST. Remove Content-Type and make sure no content is returned by OPTIONS request in REST interface. In write_html set the Content-Length when response is not encoded/compressed (fixes hang due to missing content-length with unencoded data). In REST interface do not raise UsageError for invalid api version. Return json error with proper message. Fixes crash.

"""
roundup.anypy - compatibility layer for any Python 2.3+
"""
VERSION = '.'.join(map(str,
                       (0,
                        3,
                        )))