Add migration files
Changes to migrations

Allow multiple categories on a post
Allow a reason for editing
Fix some things in the schema
rename alias to slug
Update version number in module info file
Remove version number from composer.json
Added some stuff I forgot
Change ACP_BLOG_CATEGORIES_MANAGEMENT to ACP_BLOG_MANAGEMENT
Merge pull request #76 from imkingdavid/feature/migrations

WIP: Add migration files