word2vec

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[`analogy`](https://github.com/DimaKudosh/word2vec/blob/master/src/wordvectors.rs#L89) has a return type of `Option` and takes care to [return `None`](https://github.com/DimaKudosh/word2vec/blob/master/src/wordvectors.rs#L107) if it's passed two empty vectors. However, it doesn't bother to check whether `vectors.is_empty()` and instead ends...

altayhunter

I created a branch to try out SIMD optimizations. It turned out to make a good difference. I added some bench tests to check the differences, just run `cargo bench`...

jayay