Add socket.io example for node.js

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
node-demo renamed to node-express-example

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
node-express-example: fix execution error

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
ruby: add basic functionality test

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
ruby-rails-example: add basic functionality test

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>