Hygiene: add JSHint to development dependencies
Hygiene: add JSHint to development dependencies

A .jshintrc and .jshintignore are specified indicating that the project
is developed using JSHint. This patch explicitly specifies it as a dev
dependency.

Change-Id: I29c6a78724f7fdc6a1493fd6f9dd554d0e17c1fb

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps