Add !StyleEncyclo command

Summary:
The account https://twitter.com/StyleEncyclo provides a best of articles
where the style doesn't follow the Wikipedia conventions.

The account is managed by Ælfgar.
@Raminagrobis suggested to allow to publish from IRC like !idée.

Test Plan: Test !StyleEncyclo on Freenode wikipedia-fr

Reviewers: dereckson

Reviewed By: dereckson

Subscribers: Thibaut120094

Differential Revision: https://devcentral.nasqueron.org/D830