GH71: WebSocket and broken Timeouts

fixed GH# 71: WebSocket and broken Timeouts (POCO_BROKEN_TIMEOUTS)
fixed warning in Poco/Crypto/OpenSSLInitializer.h

- fixed a warning in Poco/Crypto/OpenSSLInitializer.h (fix ported from
1.4.6)
updated Thread::start documentation

- updated Thread::start documentation (port from 1.4.6)
added BeagleBoard build configuration