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
* Added edit link for users
* 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
* Updated to use new `main` element

### Review

@germanny 
@ericrasch 
@jameswlane 

### Notes

* #28 Needs to be approved and merged into this PR before this one can be merged down to master.

* 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.