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