support multiple filters in ltn12.{sink,source}.chain()
http: do not set global TIMEOUT
http: look for PROXY in _M, not as a global
Merge pull request #69 from catwell/pull-globals

fixes related to constants in the HTTP module
include port in default Host header

See RFC 2616 section 14.23.
Merge pull request #65 from fab13n/480a818bf0ef6de32527ba14fc2bb27e754d0612

Support for several filters in ltn12.{sink,source}.chain
Merge pull request #74 from catwell/pull-hostport

Include port in default Host header
Fixed timeout bug introduced by commit e81a6ff
Add support for FreeBSD in makefile

Thanks to Leryan. See issue #78.
Add MYCFLAGS and MYLDFLAGS go allow for customization