Added a guide for fetching CKEditor with package managers.
Added information about default preset distributed in package managers.
Package Managers article corrected.
Further updates for Package Managers article.
Minor changes to Package Managers article.
Added Fetching CKEditor as a dependency headline.
Fixed commandline for Composer.
Simplified headlines to keep things dry.
Simplified bower.json.
Fixed typo.
Improved package managers guide.