RuNOS 0.2 release.

This release introduce many new features, new interfaces and significant improvements of
existing APIs. Now you can start writing your apps for RuNOS!

    - Initial implementation of maple engine that automatically assigns rule priorities.
    - Fast and easy to use packet field reading and matching API.
    - Initial flow lifecycle management (currently without tracking of flow removal).
    - Improved performance of OF message handling.
    - Allow applications to specify their interface.
    - LLDP link discovery application.
    - Initial topology-driven learning switch.
    - Now applications can live in their own threads.

Signed-off-by: Sergey Nizovtsev <snizovtsev@arccn.ru>