Fixed typo in .ruby-version.sample
Updated Travis build targets
Updated Travis CI config
Remove (unnecessary) gem post-install message.
Released v0.4.1
Observer set
Ruby Observable module is not thread safe, so every class using it is exposed to potential concurrency problems.
Two thread safe observer sets have been added, using different strategy: a copy-on-write approach and a simpler copy-on-notify.
Both use the open-call pattern for notify to avoid deadlock
fixed pending tests
Merge pull request #7 from mighe/master

Thread safe observers
Merge branch 'master' of github.com:jdantonio/concurrent-ruby
Wrote pending specs for Future#execute refactor
Implemented Future.execute and Future#execute
Removed superflous *args from Future.new
Updated Future documentation.
Implemented ScheduledTask.execute and ScheduledTask#execute
Updated ScheduledTask documentation
Future.new throws an exception when no block given, just like ScheduledTask.
Future and ScheduledTask both support Dereferenceable.
Fixed code indentation.
Updated documentation.
Fixed broken Future tests.