OFStateManager: remove unnecessary flow_add version check
OFConnectionManager: remove version check on incoming messages
OFStateManager: populate effects / out ports for OF 1.1+
OFStateManager: create flow stats entries using reply message version
OFConnectionManager: interpret connection version param as maximum version

We may negotiate a lower version.
Merge into master from pull request #12:
Improve support for OF 1.3 flow mods (https://github.com/floodlight/indigo/pull/12)