Update ruby-eventmachine to 1.0.5.

## 1.0.5 (February 2, 2015)
* use monotonic clocks on Linux, OS X, Solaris, and Windows [#563]
* use the rb_fd_* API to get autosized fd_sets [#502]
* add basic tests that the DNS resolver isn't leaking timers [#571]
* update to test-unit 2.x and improve various unit tests [#551]
* remove EventMachine_t::Popen code marked by ifdef OBSOLETE [#551]
* ruby 2.0 may fail at Queue.pop, so rescue and complain to $stderr [#551]
* set file handle to INVALID_HANDLE_VALUE after closing the file [#565]
* use `defined?` instead of rescuing NameError for flow control [#535]
* fix closing files and sockets on Windows [#564]
* fix file uploads in Windows [#562]
* catch failure to fork [#539]
* use chunks for SSL write [#545]

(taca)