Add option to remote trigger Dash on non-macOS systems

[grzlus]

I really like the idea of using this plugin

But recently I changed my setup. I have a PC with Linux installed. I'm using SSH to connect to it and I work on my MBP. Due to that problem, I wasn't able to use this plugin. Now I added a small change, so instead of triggering open on local machine, I can do it via ssh on some other machine - in my case, on my MBP. I only need to add let g:dash_remote_domain="my_IP_or_local_domain" in config file.