Added option to provide more than one convert command per target task

.gitignore

@@ -0,0 +1,2 @@
+node_modules/**
+test/resized/**

Gruntfile.js

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+module.exports = function(grunt) {
+
+  // Project configuration.
+  grunt.initConfig({
+    nodeunit: {
+      files: ['test/**/*.js']
+    },
+    watch: {
+      files: ['<%= jshint.files %>'],
+      tasks: ['default']
+    },
+    jshint: {
+      files: ['Gruntfile.js', 'tasks/**/*.js', 'test/**/*.js'],
+      options: {
+        globals: {
+          curly: true,
+          eqeqeq: true,
+          immed: true,
+          latedef: true,
+          newcap: true,
+          noarg: true,
+          sub: true,
+          undef: true,
+          boss: true,
+          eqnull: true,
+          node: true,
+          es5: true,
+          strict: false
+        }
+      }
+    }
+  });
+
+  grunt.loadTasks('tasks');
+  grunt.loadNpmTasks('grunt-contrib-jshint');
+  grunt.loadNpmTasks('grunt-contrib-nodeunit');
+
+  grunt.registerTask('test', ['nodeunit:files']);
+  grunt.registerTask('default', ['jshint','test']);
+
+};