Renaming project from Orangejuice to Lingon

Do not merge this PR, let's use it for communication around renaming until all pieces are in place. I'm trying to do everything in the following order: 

* ~~Refactor codebase with new name~~
* ~~Purchase domain: lingon.io~~
* ~~Create lingon npm module~~
* Rename repository (and sub projects: templates, plugins, etc)
* Manual test test test
* Merge this PR
* Push a "project moved" version of OJ to npm

Change-Id: Ib165bf1e73e5d95285a1842df80e59d942037cb3