separate config parser functions.
add .gitkeep
change comment
use lighttpd-1.4.32 now.
refact.
 - WebSocket-TCP Proxy does not handle subprotocol and locale.
   => use WebSocket Proxy instead.
 - type section is renamed into base64 section
 - rename some file names and functions.
   s/base64/mod_websocket_base64/, s/sha1/mod_websocket_sha1/, s/connector/socket/ etc.
 - use googletest
   => not tested all yet.
 - move config_parser functions into supplement.

 next, implement tests
 - handshake, frame, socket
   mod_websocket.c will be tested with jstest-driver.