Merge pull request #2 from andtxr/2.5

Strucuture refresh.
Update README.md
Update README.md
Merge branch 'develop'
Inserting documentation indexes.
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
Update SlugBehavior.php
Merge pull request #5 from andtxr/develop

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

Stable release.