Merge pull request #15 from raelik/master

Catch IOError in addition to the other errors being caught for each_frame
Merge pull request #16 from raelik/master

Add a closed? method to Tubesock
Release 0.2.3
removed travis rubinius, added ruby 2.1.1
Rescue Bad file descriptor in tubesock.close
Merge pull request #28 from visfleet/rescue_bad_file_descriptor

Rescue Bad file descriptor in tubesock.close
added codeship status
Version 0.2.4: Rescue Bad file descriptor in tubesock.close #28