Fix: support defaults of makePretty, makeCompact

[peteashworth]

Docs show the default for makePretty and makeCompact was false. However, it will error if the properties are not set.

var makePretty = process.env.MAKE_PRETTY.toLowerCase() === "true"; //Priority is pretty > compact > normal
                                         ^
TypeError: Cannot read property 'toLowerCase' of undefined

[jun3453]

Thank you!