Merge pull request #27 from mavenugo/app

Application async notification infra and test-cases.
Fixed Hello callback as per the RFC (Request params is an array and so is response)

Signed-off-by: Madhu Venugopal <madhu@socketplane.io>
Silly game using libovsdb as an example for applications to make use of the library

We can improve this example further to show insert / delete and modify as well.

Signed-off-by: Madhu Venugopal <madhu@socketplane.io>