refactors WOS fetch job

[coveralls]

Pull Request Test Coverage Report for Build 195

• 34 of 42 (80.95%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+11.07%) to 88.64%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
spec/factories/publication.rb	1	2	50.0%
app/models/publication.rb	0	2	0.0%
app/jobs/fetch_wos_content_job.rb	19	24	79.17%
<!--	Total:	34	42	80.95%	-->

Totals
Change from base Build 183:	11.07%
Covered Lines:	1069
Relevant Lines:	1206

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💛 - Coveralls