Adding option for auto requiring files, and fixing #323 by Isty001 · Pull Request #387 · vim-ruby/vim-ruby

First, this PR is an attempt to fix a constant problem I have in multiple projects. Sometimes a project has a 'bootstrap' file, or an entry point which has all the necessary require-s, and so no need to use require statements everywhere. In this case there will be no completion.

A possible solution is to use an option to set an array of files which are always required, so it'll work.

The rest, is a fix for #323