Fixed some phpdoc
Improved method typehints in the StringPresenter

The methods are expected specific subtypes of the Exception, not any
Exception.
Fixing typehints on askAndValidate to match parameters in DialogHelper
Avoiding counting the tokens again and again in the PSR0Locator
Fix a code block.
Merge pull request #458 from stof/phpdoc_fixes

Phpdoc fixes
Merge pull request #460 from ciaranmcnulty/bugfix-io-typehints

Fixing typehints on askAndValidate to match parameters in DialogHelper
Split the manual into smaller chapters.
Seperate the manual from cookbooks.
Merge pull request #461 from jakzal/docs-structure

Improve the docs structure