Postal driver - subscribe to '#' instead of '*' to allow for periods in topics
(see https://github.com/postaljs/postal.js/blob/f4787f506b996a1f9b926bab222aa129795ea537/example/standard/js/main.js#L15-L29)
Merge pull request #3 from darsee/hotfix-postal-wildcard

Postal driver - subscribe to '#' instead of '*' to allow for periods in topics