Set up Grunt

Fixing up Grunt file to watch for directories

Exclude node modules folder from Jekyll built site

node_modules/csswring/test/fixtures/at-keyframes-name.css

@@ -0,0 +1,9 @@
+@keyframes "foo" {
+  from {
+    top: 0px;
+  }
+
+  to {
+    top: 100px;
+  }
+}