Ignore files ending with ~
Improve rebar.config regarding eunit tests

Add `meck` as a dependency and make tests verbose.
Add tests for correct generation id in respond to a role request

Add eunit test verifying correct behavior in ofp_client while sending
generation id in respond to a role request from the controller.
Correct generation id that is sent after changing controller's role

OpenFlow spec. 1.3.2 introduces clarifications on generation id that should be
enclosed in the reply to a role request sent by a controller. Now the ofp_client
complies with them and sends generation id that was set in the last successful
role change.
Add code coverage related setting to rebar.config
Merge pull request #43 from FlowForwarding/issue143

Make generation id sent in a role request message comply with OpenFlow v. 1.3.2 specs