Added multibyte string support for most methods of the 'Wolff\Utils\S…

…tr' class.

3.x

Fixed bug related to the 'title' function of the template engine

Updated to 2.8

Updated to version 2.7.0

Changelog:

* Added tests (finally!).
* New 'average' function in the standard library.
* \Core\Route::add method works for any request method.
* \Core\Controller::closure returns the result of the function.
* Fixed 'local' function of the standard library.
* \Core\Session::get and \Core\Request::{get, post, delete, patch, cookie} now doesn't perform any logging when the specified variable isn't set.
* Refactored code.

Merge branch 'master' of https://github.com/Usbac/wolff

Updated version tags and documentation link in homepage

Updated version tags

Updated composer.json