Add CONSUME_AUTO support in Kotlin DSL

[SteinerOk]

Fixes #104

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[SteinerOk]

@googlebot I signed it!

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[SteinerOk]

@chrisbanes ready.

[SteinerOk]

@chrisbanes If possible, please, release version 0.6.1 with this change, it will greatly help my project migrate to the new Insetter api. Thanks in advance.

[chrisbanes]

I'll do another release soon, probably early next week. If you need the change now, you can use the snapshot.