ci: set up continuous path-to-production for webfont library

[jimmyandrade]

As a repository maintainer
I would like to be able to launch new versions of webfont through Travis CI triggered by a push to master
So that we don’t need to publish at local development environment
And that the webfont library remains up to date

@evilebottnawi What is the possibility of doing this? So I won't have to bother you every time we need to release an update.