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update version to 0.4.1

Move `Variable` to `ndarray.ts` to avoid circular dep problem. (tenso…

…rflow#510)

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Update to 0.3.14 (tensorflow#435)

Merge branch 'master' into version

Simplify benchmarks & enable them on all devices. (tensorflow#383)

This PR:
* Enables benchmarks on all devices (whitelisted in support.js)
* Makes buttons mobile friendly with MDL.
* Adds viewport meta to the page so it scales for phones
* Moves common benchmark logic to `benchmark_util.warmupAndBenchmarkGPU`. This function warms up the GPU, times, and returns the result, and it changes functionality based on whether timers are enabled.

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