[http-server] Remove HTTP/0.9 support.

This was broken anyway and is no longer required.

This fixes issue #53.
Merge pull request #68 from dylan-lang/remove-0.9

[http-server] Remove HTTP/0.9 support.
Merge pull request #67 from cgay/dev

Use stream-contents instead of stream-sequence + clear-contents.  Use -n...
[http-server] Remove <basic-request>.

This consolidates things into <request>.
Merge pull request #69 from dylan-lang/remove-basic-request

[http-server] Remove <basic-request>.
Minor cleanups.
Fix comments, remove a log-debug.