Implemented ALPNServerConnection and refactored common code with NPN.
Refactored SPDY modules to extract into a different module the tests
that required NPN to run.
Initial support for JDK 8 builds.

Added ALPN version and moved jetty-osgi module to a profile, only
built when using JDK 7.
Refactored SPDY modules and added ALPN tests.
Updated ALPN API version to 1.0.0.