Add lint workflow

[rcowsill]

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This adds a lint workflow and fixes the jshint errors so the workflow succeeds. Most of the changes were for doublequote/semicolon use and missing "use strict" directives.

~~(WIP: still need to fix the last four "line too long" errors)~~

[rcowsill]

This is good to go now.

I'd still like to confirm that the changes to test_profile.js haven't broken anything, but I'm having trouble with the selenium/ZAP setup. I've left a message on OWASP gitter about it; any help would be much appreciated.

[ckarande]

@binarymist can you please have a look at this PR and confirm that changes to test_profile.js doesn't break selenium/ZAP tests. Thanks!