bump upto 0.1.7
fix: remove rb_p debug
cleanup
bump upto 0.1.8
print RUBY_DESCRITION when test rack spec
ready to 0.2.0
add Bossan.shutdown method
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TODO list
Up
add DEBUG macro.
add write_error_log function

write_error_log:
  print error log to stderr when unexpected connection errors occured.
add task:clean do rm mkmf.log
update README
ignore *.pid (like preforker.pid)
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fix require path to bossan
support keep-alive
deprecated: keepalive
fix: GC marking, and support keep-alive