Add template engine

This patch adds an initial simplistic template engine to separate logic
from the presentation.

Basic initial features:
- escaping via Context::noHtml() a

Add template engine

This patch adds an initial simplistic template engine to separate logic
from the presentation.

Basic initial features:
- escaping via Context::noHtml() and Context::e() methods
- blocks
- nesting options using includes and extending layouts
- PHP syntax
- variable scopes dedicated to template scope only
- Appending blocks (when JS files are in need to be appended)
- initial unit and functional tests
- Main index page refactored as an example of usage
- Very short intro docs how to use the template layer
- Thanks to @nhlm for the code review and numerous suggestions to
improve the usability and code stability,
- Thanks to @KalleZ and for the code review and numerous common sense
suggestions about templates themselves.
- Thanks to @Maikuolan for the code review and numerous suggestions
about the usability.
- Moved hash ids redirection to aseparate JavaScript file
- Use location instead of window.location in the JavaScript redirection

Discussions:
- http://news.php.net/php.webmaster/27603
- https://github.com/php/web-bugs/pull/66

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