Handle Errno::ETIMEDOUT errors

Handle a Errno::ETIMEDOUT error
Use a specific version of rspec
Merge pull request #215 from RiotGames/add_timeout_error

Handle another error in HostCommander
relax constraint on celluloid
remove explicit dependency on nio4r

Celluloid 0.15.0 locks to the appriopriate version now
verison bump 1.6.0
Use Timeout's timeout not Celluloid's
Merge pull request #217 from RiotGames/fix_217

Celluloid 0.15.0 and HostCommander error