V0.2.5

Updates and bug fixes for release of v0.2.5

### Changes

* Added wp_nav_menu theme locations
* Added accessible skip to content link
* Fixed a bug in the `category_id_class` function
* Fixed a bug in the `display_post_thumbnail` function
* Fixed a bug in the `grunt watch` task
* Fixed duplicate padding on lists
* Updated required versions of devDependencies

### Review

@germanny 
@ericrasch 
@jameswlane 

### Notes

* This release doesn't update the grunt imagemin task to overwrite the original image files with the compressed ones. That update requires directory layout changes will break backwards compatibility. It will be included in the future 0.3.0 release.