Remove dependency on lodash

lib/index.js

@@ -3,7 +3,6 @@ var fs = require('fs');
 
 var Q = require('q');
 var wrench = require('wrench');
-var _ = require('lodash');
 var glob = require('glob');
 
 var git = require('./git');
@@ -73,7 +72,14 @@ exports.publish = function publish(basePath, config, done) {
   };
 
   // override defaults with any task options
-  var options = _.extend({}, defaults, config);
+  // TODO: Require Node >= 4 and use Object.assign
+  var options = {};
+  for (var d in defaults) {
+    options[d] = defaults[d];
+  }
+  for (var c in config) {
+    options[c] = config[c];
+  }
 
   try {
     if (!fs.statSync(basePath).isDirectory()) {