Inserting the behavior code.
Update SlugBehavior.php
Merge pull request #3 from andtxr/develop

Update SlugBehavior.php
Merge pull request #4 from andtxr/2.5

Update SlugBehavior.php
Merge pull request #5 from andtxr/develop

Update SlugBehavior.php
Merge pull request #6 from andtxr/master

Stable release.
Plugin AppModel
Merge pull request #7 from andtxr/2.5

2.5
Merge pull request #8 from andtxr/master

AppModel