Make logging work in Heroku using STDERR

Without this patch none of the logging generated by the Sinatra
application or the Delayed Job are showing up in the output of `heroku
logs`.  This is a problem because we need to be able to see what's
happening with the application and the job processing.  The core problem
is that logs in Heroku are captured off the STDOUT and STDERR streams,
while the default logging for Active Record goes to a file on disk.

This patch addresses the problem by logging to STDOUT which should be
caught by Heroku.
Merge branch 'feature/master/make_logging_work'

* feature/master/make_logging_work:
  Make logging work in Heroku using STDERR
Enable travis CI support

This patch adds the `.travis.yml` configuration as described at
http://about.travis-ci.org/docs/user/languages/ruby/

This patch also trims down the Gemfile to manage the dependency list
efficiently for Travis.
Merge pull request #8 from jeffmccune/feature/master/travis

Enable travis CI support