Cli train embeddings

[coveralls]

Pull Request Test Coverage Report for Build 842

• 261 of 274 (95.26%) changed or added relevant lines in 26 files are covered.
• 12 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+2.0%) to 95.113%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
vecto/data/io.py	15	17	88.24%
vecto/benchmarks/text_classification/text_classification.py	11	14	78.57%
vecto/benchmarks/visualize.py	7	10	70.0%
vecto/embeddings/init.py	5	10	50.0%
<!--	Total:	261	274	95.26%	-->

Files with Coverage Reduction	New Missed Lines	%
vecto/benchmarks/text_classification/text_classification.py	1	88.28%
vecto/corpus/corpus.py	1	91.11%
vecto/embeddings/utils/subword.py	2	92.82%
vecto/utils/fetch_benchmarks.py	8	0.0%
<!--	Total:	12		-->

Totals
Change from base Build 778:	2.0%
Covered Lines:	4515
Relevant Lines:	4747

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💛 - Coveralls