This adds support for the `<=` and `<` version operators in `.discourse-compatibility` files. This allows for more flexibility (e.g. targeting the entire 3.1.x stable release via `< 3.2.0.beta1`), and should also make compatibility files to be more readable.
If an operator is not specified we default to `<=`, which matches the old behavior.
It's very easy to forget to add `require 'rails_helper'` at the top of every core/plugin spec file, and omissions can cause some very confusing/sporadic errors.
By setting this flag in `.rspec`, we can remove the need for `require 'rails_helper'` entirely.
This allows text editors to use correct syntax coloring for the heredoc sections.
Heredoc tag names we use:
languages: SQL, JS, RUBY, LUA, HTML, CSS, SCSS, SH, HBS, XML, YAML/YML, MF, ICS
other: MD, TEXT/TXT, RAW, EMAIL
