Added compatibility with passing S3 url for the template instead of a local file.
Pass notification urn to AWS api

Adds an option parameter to allow notifiaction urn's to  be passed
through to the underlying aws api calls when manipulating cloudformation
stacks.
Merge branch 'master' of https://github.com/robcoward/cloudformer into robcoward-master

Conflicts:
	lib/cloudformer/version.rb
Merge branch 'robcoward-master'