Use EMBER_CLI_INJECT_LIVE_RELOAD_BASEURL in the injected script

[Emerson]

    return "(function() {\n " +
           "var src = (location.protocol || 'http:') + '//' + (location.hostname || 'localhost') + ':" + liveReloadPort + "/livereload.js?snipver=1';\n " +
           "var script    = document.createElement('script');\n " +
           "script.type   = 'text/javascript';\n " +
           "script.src    = src;\n " +
           "document.getElementsByTagName('head')[0].appendChild(script);\n" +
           "}());";

Certainly possible I'm missing something, but I suspect the dynamic script we are loading should be using the same baseURL that's defined in the EMBER_CLI_INJECT_LIVE_RELOAD_BASEURL environment variable.

Feel free to close this if I'm wrong 👍

[lukemelia]

In master, this is now independently configurable.