Fix an uncaught exception in Drush methods.

We already know that the output of 'drush --format=yaml'
is not in YAML format in every case. But, sometimes,
YAML.load does not raise an exception. Make sure
that the structure returned by YAML.load is a hash.
Print [Patched] when an updated project is patched.
Bump version.
Add release notes for 1.1.4.