Croatian language update
Merge pull request #436 from primjeri/2

Croatian language update
Added check_all param to in_group
Fixed issue with wrong lname validation language item being referenced.

via @Dannymx.

Resolves issue #439.
Merge pull request #440 from kamasheto/fix/in_group

Added check_all param to in_group
Define foreign keys, db engine, and encoding

Sometimes it's necessary to manually delete users and/or groups directly in the database.  
Adding 'on delete' cascade actions and foreign keys ensure that no null references are left whenever users and/or groups are deleted.
Merge pull request #443 from LuCiAn0/2

Define foreign keys, db engine, and encoding
Update index.html

Documentation was missing Email Activation for registration config setting explanation. Seems obvious when looking at the configuration file, however people may look at the documentation first.
Merge pull request #446 from Relequestual/2

Update index.html
Combine multiple calls of unset_userdata into one

Because CI sends cookie on every unset_userdata call.
Merge pull request #448 from shijialee/patch-1

Combine multiple calls of unset_userdata into one
Update auth.php

Updated phone to use only one field instead of three.
Update edit_user.php

Updated phone to use one field instead of three.
Update create_user.php

Updated phone to use one field instead of three.
Merge pull request #450 from mahtar/2

Fixed phone field warning
Update index.html in userguide for groups

Added result() method in usage
Merge pull request #451 from karnajani/2

Update index.html in userguide for groups
fixing spanish translation
added Spanish translations
Merge pull request #452 from ibarrajo/2

Added and fixed spanish translations