[BioRuby] Travis-CI & bundler problem

[Joachim Baran]

Hello,

  Iain, I found out why the tests got stuck: an IO.pipe was filled up
(synchronous read/write control flow). I changed the test where the problem
occurred to use a temporary file instead.

  If you would like to add your changes that you made to the unit tests,
then please update your fork and send me a pull request later.

  Note: BioInterchange no longer supports Ruby 1.8. It requires 1.9 or
later now.

Joachim