AWSObject instance can now be bound to a template when passed to constructor
AWSObject can now have properties, this allow to extend models
Fix AWSProperty that should not output a named dict
Merge remote-tracking branch 'source/master' into fixes

Conflicts:
	troposphere/__init__.py
Fix a tiny pep8 typo
Fix initialization flag test
Merge branch 'fixes' of https://github.com/jeanphix/troposphere into jeanphix-fixes