Merge branch 'release0.3.0' into develop
Adds src/**/*.rb to reek's source_files list
Updated roodi's target file list.
fix build warning on 64bit env.

- fix warnings
- add "-Werror" into ruby/extconf.rb
Updated flog's target-file list.
Merge branch 'develop' of https://github.com/trema/trema into develop
Updated flay's target-file list.
Deletes unused yard:* tasks
Add some comments to Rakefile
Add code quality checker
Refactor the cucumber tests of FeaturesRequest message
Add YARD comment of Controller#list_switches_reply (Thanks Tomizawa-san)
Add a link to Controller#list_switches_reply YARD doc.
Version bump to 0.3.1
Merge branch 'release0.3.1'