David Taylor ea032d8372 Improve source code linting for continuous integration (#5017)
* Add rubocop linting to docker:test rake task

* Add eslint JS listing to plugin files, and add SKIP_LINT variable

* Fix failing ‘polls’ plugin eslint

Using eslint-disable-line, as is done in core qunit tests such as `acceptance/group-logs-test.js.es6`

* Add plugin test eslint to travis config

* Merge some eslint lines
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