handle SSLErrorWaitReadable/Writable as SSLErrors on Ruby 1.8 and 1.9 mode
- since (and if) `IO::WaitReadable` / `IO::WaitWritable` are not available
pass the runtime around in SSLSocket's waitSelect instead of calling `getRuntime`
Merge pull request #1748 from kares/openssl-load-18-fix

openssl load 1.8 (and possibly 1.9 compatibility) fix