Localhost detector

I like the idea. Unfortunately, there are sites that have dev in them that this triggers on, like `dev.azure.com` for example. This means I have the banner popup in places it shouldn't be. Without any ability to customize the matching I had to uninstall. It's a cool idea though!

Simple and useful.

Works only by reading url, so no way to know if you're on localhost when using virtual hosts.

Love this one! So nice to have a big bright visual cue to distinguish local experimental development from breaking things on the live server *grin*