allow for rfc2616 chunk extensions
Merge pull request #274 from carlor/add_chunk_ext

Allow for RFC 2616 chunk extensions
Bind outgoing connections in the Win32 driver so that they have a name.
Implement setTaskEventCallback (for debugging task switches, only enabled in -debug mode).
Merge branch 'master' of https://github.com/rejectedsoftware/vibe.d