Update deps.

Gruntfile.coffee

@@ -83,10 +83,6 @@ module.exports = (grunt) ->
         createTag: false
         push:      false
     shell:
-      options:
-        stdout: true
-        stderr: true
-        failOnError: true
       checkout:
         command: 'git checkout <%= pkg.meta.mainBranch %>'
       commit:

package.json

@@ -31,7 +31,7 @@
     "grunt-contrib-concat": "~0.4.0",
     "grunt-contrib-copy": "~0.5.0",
     "grunt-contrib-watch": "~0.6.1",
-    "grunt-shell": "~0.6.4",
+    "grunt-shell": "~0.7.0",
     "load-grunt-tasks": "~0.4.0"
   },
   "repository": {