Allow test runs to grep

gulpfile.js

@@ -2,6 +2,7 @@
 
 var gulp    = require('gulp');
 var plugins = require('gulp-load-plugins')();
+var argv    = require('yargs').argv;
 
 gulp.task('cover', function () {
   return gulp.src('./src/**/*.js')
@@ -10,6 +11,8 @@ gulp.task('cover', function () {
 
 gulp.task('test', ['cover'], function () {
   return gulp.src('./test/**/*.js')
-    .pipe(plugins.mocha())
+    .pipe(plugins.mocha({
+      grep: argv.grep
+    }))
     .pipe(plugins.istanbul.writeReports());
 });
\ No newline at end of file

package.json

@@ -36,7 +36,8 @@
     "gulp-mocha": "1",
     "jshint-stylish": "1",
     "mocha": "1",
+    "nock": "0.42",
     "sinon": "1",
-    "nock": "0.42"
+    "yargs": "1"
   }
 }