runs a .ram script
function run(opts) {
    throwIfRequiredOption(opts, 'src')

    // register `.ram` extension in nodejs modules
    Module._extensions[util.ext] = function(module, filename) {
        var content = fs.readFileSync(filename, 'utf8')
        var result = ram.compile(content, {
            filename: filename,
            format: 'cjs',
        })
        module._compile(result.js, filename)
    }

    Module.prototype.load = function load(filename) {
        var extension = path.extname(filename)
        this.filename = filename
        this.paths = Module._nodeModulePaths(path.dirname(filename))
        Module._extensions[extension](this, filename)
        return this.loaded = true
    }

    var src = opts['src']
    var absolute = path.resolve(process.cwd(), src)
    // globalize Ramda module to be used by loaded modules
    Object.assign(global, R)
    require(absolute)
}