"latest" API documentation is for beta2, not beta3

_From @huonw on November 26, 2018 23:56_

Visiting https://deeplearning4j.org/api/latest/ seems to show the documentation for beta2, not beta3, e.g. https://deeplearning4j.org/api/latest/org/deeplearning4j/eval/Evaluation.html shows [the documentation at 1.0.0-beta2](https://github.com/deeplearning4j/deeplearning4j/blob/deeplearning4j-1.0.0-beta2/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/eval/Evaluation.java#L45-L77), not [the beta3 state](https://github.com/deeplearning4j/deeplearning4j/blob/deeplearning4j-1.0.0-beta3/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/eval/Evaluation.java#L29) (deprecation).

(Also, https://deeplearning4j.org/api/1.0.0-beta2 works, but https://deeplearning4j.org/api/1.0.0-beta3 does not.)

_Copied from original issue: deeplearning4j/deeplearning4j#6773_