restore the correction about header file
fixed issues with sending / receiving (#223)
thanks Takahashi-san
fixed a packet_in message issue (#218)
thanks Kanamori-san
Enables 'trema run show_topology' etc. while running other controllers.
Allow port stats reply with empty body.
Version bump to 0.2.7
Merge branch 'release0.2.7' into develop
Renamed
Add echo request cucumber test.
Add tests of echo reply handler
Deletes unused files (refs #226)
Refactor hello_switch.c
Track .h to .h dependencies.
Removed openflow_h's dependency to objects dir, which caused unnecessary rebuild on some cases
Merge pull request #227 from y-higuchi/fix_dependency

Track .h to .h dependencies.
Merge pull request #228 from y-higuchi/objects_dir_dep

Removed openflow_h's dependency to objects dir
Fix rcov not working
Exclude gems dir from coverage result.
Merge pull request #229 from y-higuchi/fix_rcov

Fix rcov
Merge pull request #230 from miz-take/prototype

closes #225