Hello -> Pio::Hello in YARD comments.
Hello.read raises Pio::ParseError instead of BinData's exceptions.
Add Echo YARD comments.
Hello -> Pio::Hello in YARD comments.
Merge pull request #70 from trema/feature/echo_doc

WIP: echo YARD comments
Merge remote-tracking branch 'origin/develop' into develop
Add Pio::Features.read spec.
Add Features::Request.new.
Add YARD comments to Features classes.
Merge pull request #71 from trema/feature/features_request

WIP: FeaturesRequest
Fix wording.
Merge branch 'develop' into feature/features_reply