Update validation.php

Language validation addition for https://github.com/laravel/framework/pull/4599
Merge pull request #2948 from TheShiftExchange/patch-1

Update validation language to include boolean
Update validation.php
Merge remote-tracking branch 'origin' into laravel
changes
Merge branch 'laravel' of https://github.com/tianweilong/laravel-1 into laravel

Conflicts:
	app/routes.php
auth