Making it so that all config can be provided via task config

I'm not sure how you're trying to pass the parameters here. `this.options()` is empty if options aren't specified for the task in the configs, see http://gruntjs.com/configuring-tasks#options. I'm assuming that your idea is to pass the arguments somehow along the way of `grunt tx-project-resources --transifex.auth.pass=foo`, in which case this doesn't work. To get cmd line arguments you can use `grunt.option`.