Add WildCard JSON Lists

[nathanataws]

Issue #, if available:
Addressing some parts of issue #27

What

• Add the ability of wildcards to match against lists
• Create JSON list type
• Add a guard for extraneous whitespace lines
• Update the README to discuss new wildcard and JSON list behavior

Why

• To allow for somewhat-more-graceful handling of the different parsing of intrinsics by allowing for rules like:

let tag_vals = [{"Key":"OwnerContact","Value":"OwnerContact"},{"Key":"OwnerContact","Value":{"Ref":"OwnerContact"}}]
AWS::EC2::SecurityGroup Tags.* NOT_IN %tag_vals 

• To fix a list parsing issue with json inside a list form and flatten it out to strings like the other list items
• To prevent strange edge cases with whitespace lines
• To document the changes.

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