Added installation script to Core module, all migrations code has been removed.
Merge remote-tracking branch 'origin/0.4.0' into 0.4.0

Conflicts:
	app/engine/Console/Commands/Assets.php
	app/engine/Console/Commands/Database.php
	app/engine/Generator/Migrations.php
	app/engine/Generator/Migrations/Model.php
	app/engine/Installer.php
	app/migrations/0.4.0/access.php
	app/migrations/0.4.0/content.php
	app/migrations/0.4.0/language_translations.php
	app/migrations/0.4.0/languages.php
	app/migrations/0.4.0/menu_items.php
	app/migrations/0.4.0/menus.php
	app/migrations/0.4.0/package_dependencies.php
	app/migrations/0.4.0/packages.php
	app/migrations/0.4.0/pages.php
	app/migrations/0.4.0/roles.php
	app/migrations/0.4.0/session_data.php
	app/migrations/0.4.0/settings.php
	app/migrations/0.4.0/users.php
	app/migrations/0.4.0/widgets.php