fixed if condition for softdelete

Removed unnecessary uses of the hydrateModel

Avoid model being null when mutator doesnt return anything

- Fix santigarcor#231
- Added exception that warns about santigarcor#211

Merge remote-tracking branch 'origin/5.0' into 5.0

Add posibilityy to pass single role and permission string to ability

Fix santigarcor#213

Disabled upgrade command and fix middleware plural

Update Docs & Readme

Fix santigarcor#203

Fix santigarcor#179

Fix santigarcor#172

Changed the commands 'fire' method to 'handle'  in order to work properly in Laravel 5.5 according to this  laravel/framework@ac9f29d