Fixes #311 #106. Copied parakeety/coffeelint-prefer-english-operator

@parakeety does everything here look ok? One potential option would have been to make your repo a dependency, but I think it makes more sense for all core rules to live in this repo. Pulling in an external rule could also result in different builds of the same version of CoffeeLint having different versions of the same rule.

I verified that installing 3rd party rules can overwrite core rules. Once I started testing that I found that npm only has `coffeelint-prefer-english-operator 0.0.3`. Users of your rule will not get the latest version when CoffeeLint upgrades. Would you mind pushing a new version before I merge this? Also, do you want to change your message, maybe to include a shortened link to a page explaining that they can remove your rule from the config?