Use JSHint.
Fix errors found by JSHint.
Release 4chan X v1.9.15.20.
Merge branch 'Stable' into Beta

Conflicts:
	LICENSE
	builds/4chan-X-beta.crx
	builds/4chan-X-beta.meta.js
	builds/4chan-X-beta.user.js
	builds/4chan-X-noupdate.crx
	builds/4chan-X-noupdate.user.js
	builds/4chan-X.crx
	builds/4chan-X.meta.js
	builds/4chan-X.user.js
	builds/4chan-X.zip
	builds/updates-beta.xml
	builds/updates.xml
	package.json
Fix CHANGELOG.md
Release 4chan X v1.9.16.1.