Remove usage of this._ - only using modules now

lib/base.js

@@ -5,6 +5,7 @@ var path = require('path');
 var events = require('events');
 var assert = require('assert');
 var _ = require('lodash');
+var _s = require('underscore.string');
 var async = require('async');
 var findup = require('findup-sync');
 var chalk = require('chalk');
@@ -336,10 +337,10 @@ Base.prototype.parseOptions = function () {
 Base.prototype.checkRequiredArgs = function () {
   // If the help option was provided, we don't want to check for required arguments,
   // since we're only going to print the help message anyway.
-  if (this.options.help) { return; }
+  if (this.options.help) return;
 
   // Bail early if it's not possible to have a missing required arg
-  if (this.args.length > this._arguments.length) { return;}
+  if (this.args.length > this._arguments.length) return;
 
   this._arguments.forEach(function (arg, position) {
     // If the help option was not provided, check whether the argument was required,
@@ -524,7 +525,7 @@ Base.prototype.hookFor = function hookFor(name, config) {
   // add the corresponding option to this class, so that we output these hooks
   // in help
   this.option(name, {
-    desc: this._.humanize(name) + ' to be invoked',
+    desc: _s.humanize(name) + ' to be invoked',
     defaults: this.options[name] || ''
   });