Note that uglify is unnecessary on node 8.3.0

Handle null when value should be string

Avoid calling substring to remove a comma.

Fixes #15

If a value is undefined, it shouldn't be passed to fastSafeStringify

Add ability to uglify generated code

Allow non alpha keys

Allow specifying deep additionalProperties=true

Fixes #33

Support for long integers

Faster string serialization

Optional properties support

Update standard to the latest version 

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Added Greenkeeper

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