go-tour: remove cube roots exercise

Complex numbers aren't covered by the tour (yet) and this has always been a pretty esoteric exercise. I'd like to replace it with something more practical. TBR=campoy R=golang-codereviews CC=golang-codereviews https://codereview.appspot.com/111480043
Go-zh · Jul 22, 2014 · cf43b78 · cf43b78
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diff --git a/content/moretypes.article b/content/moretypes.article
@@ -250,17 +250,6 @@ Implement a `fibonacci` function that returns a function (a closure) that return
 
 .play prog/tour/exercise-fibonacci-closure.go
 
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-* Advanced Exercise: Complex cube roots
-
-Let's explore Go's built-in support for complex numbers via the `complex64` and `complex128` types. For cube roots, Newton's method amounts to repeating:
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-.image /content/img/newton3.png
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-Find the cube root of 8, just to make sure the algorithm works. (There is a [[http://golang.org/pkg/math/cmplx/#Pow][Pow]] function in the `math/cmplx` package to check your results.)
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-.play prog/tour/advanced-exercise-complex-cube-roots.go
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 * Congratulations!
 
 You finished this lesson!

diff --git a/content/prog/tour/advanced-exercise-complex-cube-roots.go b/content/prog/tour/advanced-exercise-complex-cube-roots.go
diff --git a/solutions/complexcube.go b/solutions/complexcube.go