On Travis, use 17.0 and 17.1
Added debug_info to Emakefile.src, updated .travis.yml
Merge pull request #56 from th0114nd/master

Added debug_info to Emakefile.src
don't duplicate channel in state#channels if subscribe is called multiple times on it
flesh out testing a bit
Merge pull request #60 from mediocregopher/deduplicate-sub

don't duplicate channel in state#channels if subscribe is called multiple times on it