Modernize pyrex -> cython

http_request.__repr__(): a more useful repr

http_file.abort(): manually abort receiving content

request.abort(): manually indicate that a request is being aborted (mostly to shut down the read thread)

Added parameters for hostname/ip# and port # in field.js of field demo

backdoor -> coro.backdoor

backdoor -> coro.backdoor

terminal.handle_packet(): support ctrl-n with ctrl-p (kinda works)
__main__: use tlslite server (for security)

Note: no decoding support yet.

hixie_76: don't send pongs

after appending to the terminal, scroll cursor into view

websocket support & demos

split _ldap.pyx into coro.asn1.ber and coro.ldap.query

use cython quadtree implementation