Log Message:
Update ruby-eventmachine to 1.0.8.

# Changelog

## 1.0.8 (August 6, 2015)
* fix kqueue assertion failed, postpone ArmKqueueWriter until all events are \ 
processed [#51, #176, #372, #401, #619]
* fix Rubinius GC, crank the machine from Ruby space when running Rubinius \ 
[#201, #202, #617]
* test to show that LineText2 preserves whitespace and newlines [#32, #622]
* bump up compiler warnings and resolve them [#616]
* fix Windows x64 use uintptr_t instead of unsigned long for binding pointers \ 
[#612, #615]
* fix linetext2 unroll tail recursion to avoid stack level too deep [#609]
* fix for compilation with SSL on windows [#601]
* open file descriptors and sockets with O_CLOEXEC where possible [#298, #488, #591]
* fix SmtpClient: send second EHLO after STARTTLS. [#589]
* fix nul-terminated strings in C, use StringValueCStr instead of StringValuePtr