Small cleanup#110

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reef-actor wants to merge 6 commits intoAthlon1600:masterfrom

reef-actor:master

Commits on Jan 29, 2018

Move remove_js into dedicated plugin
reef-actor
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Commits on Jan 30, 2018

Move replace_title into dedicated plugin
reef-actor
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Refactor ProxifyPlugin
reef-actor
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Simplify AbstractPlugin
reef-actor
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Commits on Feb 1, 2018

Return the url_pattern filter to AbstractPlugin
reef-actor
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Commits on Feb 5, 2018

Remove const visibility modifiers froim AbstractPlugin & ProxifyPlugin
reef-actor
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