Fixed some syntax errors

The `Zend\Code\Generator\ClassGenerator` class does not have a `setMethod` method which takes a `Zend\Code\Generator\MethodGenerator` param. Instead the `addMethodFromGenerator` method exists.

Also an object of type `Zend\Code\Generator\FileGenerator` cannot be echoed, the `generate` method should be called instead.
Authentication\DbTable documented as deprecated
zend.db.row-gateway.rst populate call

In order to update the row, second parameter of populate ($rowExistsInDatabase) must be true
Removed outdated pages
Updated installation and project structure pages
Removed project structure page
Fixes #1268 - Some examples are not showing in View Helper - URL
Fixes some code examples for navigation tutorial
Fix wrong markup for bold text
Fix headlines for Zend\Barcode
Update zend.permissions.rbac.examples.rst

missing $this in AssertUserIdMatches::assert
change global.php to local.php
Change bug in Routing

Please to also add sql to create the table, have not checked the ones in comments, since I have created my table manually
Update skeleton-application.rst

Just a typo ;)
Add line numbers for code examples in unit test tutorial
Update zend.cache.storage.plugin.rst

fix typos
Updating docs for Zend\Code\Generator changes
Fix code example in View Helper - HeadLink
Merge branch 'hotfix/#1264-cleanup-ref-folder'
Remove obsolete exception documentation

- Zend\Exception never existed...