Fix REST API for WSGI Add dictionary-like headers attribute. Similar to the apache implementation in same directory but we look up the given header in the wsgi environment. Environment entries are mangled (all uppercase, '-' replaced with '_', prefix HTTP_). So on lookup we mangle the given name first. This allows the rest implementation (and others) to look up headers.

from roundup.dist.command.build import build_message_files, check_manifest
from distutils.command.install_lib import install_lib as base

class install_lib(base):

    def run(self):
        check_manifest()
        build_message_files(self)
        base.run(self)