Merge pull request #43 from WebDevStudios/2.7.1

2.7.1 - Fixes an issue with Slideshows and Custom Sidebars
Update sidebars.php

checkbox used to be using the post type Label Name for value, now it uses the actual post type name (slug)
New check for All-<custom_post_type> sidebar replacing
Fix incorrect hook name (trash_post should be trashed_post)
Don't use post type Label Name for values, use post type name (slug)
remove extra parenthesis (parend?)
Check for sidebar post type and prevent duplicate default sidebar slugs.
Merge in pull request #56, props @pypeline