Update sequence.py

[stefanches7]

Based on BED file columns ordering: use strand information to reverse the motif automatically, and add the possibility to take just score as a target

[Avsecz]

Note that strand specificity has to be turned off by default.

[coveralls]

Pull Request Test Coverage Report for Build 388

• 4 of 6 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 91.985%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kipoiseq/dataloaders/sequence.py	4	6	66.67%
<!--	Total:	4	6	66.67%	-->

Totals
Change from base Build 374:	0.01%
Covered Lines:	723
Relevant Lines:	786

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💛 - Coveralls