v0.3.0

[seliopou]

This pull request is in preparation for the v0.3.0 release of this library. The merge commit for this pull request will be tagged as the release commit.

[seliopou]

Tentative release notes:

Major Enhancements

• Replace lwt-based runtime with async-based runtime (Async Runtime #65, error-handling for async #67, of0x04-fix: Fix generating and sending groupmods. #68, Make handshakes more robust #90)
• Move notion of "pseudoport" into action type in abstraction layer (Reorganize Ports and Actions #100)

Minor Bugfixes

• Parse and serialize constants and unsigned integers
• Properly delete all tables and groups in OpenFlow 1.3 (fix-delete-all: Use OFPG_ANY when deleting all flows to select all flows... #71, delete-flows: delete flows from all tables, not just table 0. #74)

Minor Enhancements

• Pretty-print IP and MAC addresses
• Support the OFPP_TABLE pseudoport
• Implement to_string for OpenFlow 1.3 messages (of0x04-fix: Fix generating and sending groupmods. #68)
• Improve to_string for OpenFlow 1.0 (Improve Message.to_string for OpenFlow0x01 #106)
• Export more pretty-printing functions for the abstraction layer (Expose more pretty printing functions in SDN_Types #110)

[reitblatt]

LGTM.