Use a more general jruby version with specific gemset.
Remove Gemfile.lock file since we're working on a gem.
Also don't use specific versions for dev dependencies.
Update jnotify to version 0.94 to fix problems with detecting file modifications on osx
The notifier should not raise an error when #stop is called before #run.
Use the #Array wrapper function instead of checking for Enumerable
Start to use travis for testing