Changed Yii autoloader to support loading PSR-4 classes only (i.e. PEAR-styled classes not supported anymore)

Doc fixes

Typo fix

Fix doc for generateSalt.

$cost must be in range 4-31.

verify #1755 works

Conflicts:
	framework/yii/db/ActiveQuery.php

Update view.md

Fixed URL parsing so it's now properly giving 404 for URLs like `http://example.com//////site/about`

1. It results in much smaller download and takes less disk space (25MB instead of 180MB for yii-basic + dependencies).
2. It requires less utilities to be installed (no VCS binaries required).
3. It takes less time to install dependencies.

Add handler property to yii\web\Session

and 7ba6a063

Fixed label attributes in BaseHtml

fix when $_SERVER['HTTPS'] is "ON"