Deckset feature request
println("\"Normal\" code.")
[center] ```swift println("Centered code: idea 1.")
---
```swift centered
println("Centered code: idea 2.")
println("Centered code: idea 3.")
println("\"Normal\" code.")
[center] ```swift println("Centered code: idea 1.")
---
```swift centered
println("Centered code: idea 2.")
println("Centered code: idea 3.")