Make rubocop ignore remote repositories
The introduction of rubocop (Commit
70f3919) missed blacklisting files
which are not part of mediawiki/core. Developers running rubocop
against their working copy would end up with errors reported against
code which is out of the mediawiki/core repository.
Instruct rubocop to ignore some well known paths:
Place holders for additional repositories:
- extensions
- skins
- vendor
And tests/frontend/node_modules which is populated via npm install.
Change-Id: I1abdaa3ef110d981e3c017667f87e698016d6805