Don't wait for Dart Editor process to terminate

Use `Popen` instead of `call` to avoid waiting on the process to
terminate. We don't want to block ST.

Add logging and check for Dart Editor error code if it fails
quickly.
Fix call
Edit CHANGELOG.txt
Integrate with Travis
Merge pull request #114 from guillermooo/travis

Integrate tests with Travis
Merge pull request #111 from guillermooo/sdk

Don't wait for Dart Editor process to terminate
Hook up announcement for 0.1
Prepare release