Update 0.4

Big update
Revert "Update 0.3"

This reverts commit 1383c289e14452f9000ecf62796b330d35a36392.

Conflicts:
	index.php
	models/tag.php
	src/js/JAjax.js
	src/js/JEngine.js
	src/php/ajax.php
	src/php/class/Motor.php
	src/php/class/User.php
	styles/default_style.css
	tack_bdd.sql
Revert "Revert "Update 0.3""

This reverts commit 53c645d134ce797dc464c699171fc1ab613eb8cb.