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' into develop
Increase sleep time in some specs for slow environments.
Merge branch 'develop' into topo-trema-C
Merge branch 'topo-trema-C' into topo-trema-Ruby