Fix: HttpConnectProxy partial support for Titanium/Apache, and add tests.

[kenjiuno]

Fix: HttpConnectProxy partial support for Titanium/Apache.

• This fix supports the following pattern, receiving 2 chunks:
  HTTP/1.1 200 Connection Established\r\n and
  content-length: 0\r\n\r\n
  It is covered by test TestHttp11ComplexMultiPacket
• This fix does not support the following pattern. In case of: proxy server sends both http response header and body in one packet!
  HTTP/1.1 403 Forbidden\r\n ... </body></html>
  This failure test is covered by test TestHttp11ComplexOnePacketAsForbidden

Fix #104