Core_Model: More built-in observers have been added: 'created_by', 'updated_by', 'deleted_at', and 'deleted_by'.
Core_Model: Adding skip_observers() global scope.
Tagging a Release Candidate - v4.0.0-rc4.
README.md: Adding links to CodeIgniter 3.0-dev documentation.
Minor corrections about some error messages.
Corrections about property presence detection (properties with NULL value).
Core_Model: A correction.
Tagging a Release Candidate - v4.0.0-rc5.
A update and corrections in Core_Model class (BC is kept).
An insignificant change.
Merge branch 'master' of https://github.com/ivantcholakov/starter-public-edition-4 into develop