Added options argument to CloudFormationTemplate __init__ method.
Made setup.py executable.
Added advanced usage tutorial.
Fixed docstring on cors-having bucket.
Added Basic support for Conditions
Merge remote-tracking branch 'upstream/pr/24'
pyplates are easier to subclass
Merge remote-tracking branch 'upstream/pr/25' into HEAD
lint
Conditionals support

- Intrinsic conditional functions in functions module
- Conditions container and Condition items in core module

Many huge docs fixes, and remove seemingly unused Metadataums and ConditionItem classes.
Merge branch 'conditionals'
cli usage reflects installed script name
Autogenerated pbr files are ignored