Move "Forms" Admin Menu

Forms are more tangible like posts, pages, media, and comments; and less like settings, plugins, and appearance. We should move it up to the top section (posts, pages, etc) since it really isn't a setting.

![ninja-forms-menu-position](https://f.cloud.github.com/assets/1065372/1709084/d9bcdb7a-6118-11e3-96af-b8fc184d69f1.png)