How to add a plugin FontSize?

[araslanov-e]

Add file fontsize.js, and Object #

[wilgoszpl]

I updated all supported plugins.

I'm not sure what caused the problem when you created this issue, but currently, after updating redactor editor, all you need to do is follow documentation here: https://github.com/SammyLin/redactor-rails#using-plugins

When I'm writing this comment, version of redactor-rails included this fix is not published to rubygems, so you should specify github: 'sammylin/redactor-rails' in your gemfile