Use glob and fs instead of Grunt, fixes #2

lib/index.js

@@ -1,9 +1,10 @@
 var path = require('path');
+var fs = require('fs');
 
 var Q = require('q');
 var wrench = require('wrench');
 var _ = require('lodash');
-var grunt = require('grunt');
+var glob = require('glob');
 
 var pkg = require('../package.json');
 var git = require('./git');
@@ -70,23 +71,29 @@ exports.publish = function publish(config, done) {
   // override defaults with any task options
   var options = _.extend({}, defaults, config);
 
-  if (!grunt.file.isDir(options.base)) {
-    done(new Error('The "base" option must be an existing directory'));
+  try {
+    if (!fs.statSync(options.base).isDirectory()) {
+      done(new Error('The "base" option must be an existing directory'));
+      return;
+    }
+  } catch (err) {
+    done(err);
     return;
   }
 
-  var files = grunt.file.expand({
-    filter: 'isFile',
+  var files = glob.sync(options.src, {
     cwd: options.base,
     dot: options.dotfiles
-  }, options.src);
+  }).filter(function(file) {
+    return !fs.statSync(path.join(options.base, file)).isDirectory();
+  });
 
   if (!Array.isArray(files) || files.length === 0) {
     done(new Error('Files must be provided in the "src" property.'));
     return;
   }
 
-  var only = grunt.file.expand({cwd: options.base}, options.only);
+  var only = glob.sync(options.only, {cwd: options.base});
 
   function log(message) {
     if (!options.silent) {