Log Message:
Update ruby-eventmachine to 1.0.7.

## 1.0.7 (February 10, 2015)
* fix delay in kqueue/epoll reactor shutdown when timers exist [#587]
* fix memory leak introduced in v1.0.5 [#586]
* expose EM.set_simultaneous_accept_count [#420]
* fix busy loop when EM.run and EM.next_tick are invoked from exception handler \ 
[#452]