build: Use blacklist instead of whitelist for jshint/jscs/jsonlint
* jsonlint now includes docs/, includes/ (api and installer i18n),
maintenance/, and tests/.
539 files -> 864 files.
- Continue to exclude JSDuck artefacts in docs/js/.
- Continue to exclude vendor/.
* jshint now includes mw-config/ and maintenance/.
177 files -> 179 files.
* jscs now includes everything jshint includes.
172 files -> 179 files.
- The -skip.js files no longer need excluding.
Use the native exclude syntax for jshint and jscs so that other
software and services with JSHint support use these as well.
Change-Id: Idebf30275f9c93483069367f923ed290c38e0b26