Removed public="false" from the service block example

Since this service must be public otherwise you can't use it when you would like to render it like this:
        $blockHelper = $this->get('sonata.block.templating.helper');

        $block = $blockHelper->render(array(
                'type'      => 'sonata.block.service.text',
                'settings'  => array(
                        'content'   => 'My content'
                    )
            )
        );
Merge pull request #125 from eriwin/patch-1

Removed public="false" from the service block example
Merge pull request #124 from interstroom/master

Add a logger to BlockContextManager
Fix unit tests and method signature due to last PR ...
Fix cache management
Removed public="false" on service sonata.block.templating.helper

Made sonata.block.templating.helper public so you can use it separately to render block.

	$blockHelper    = $this->get('sonata.block.templating.helper');

	// Build the vacancy block
	$vacancyBlockData = $this->getDoctrine()->getManager()->getRepository('AcmeBlockBundle:Block')->findOneByType('acme.block.service.vacancy');
	$vacancyBlock = $blockHelper->render(array(
		'type'      => $vacancyBlockData->getType(),
		'settings'  => $vacancyBlockData->getSettings(),
	));
Merge pull request #126 from eriwin/patch-2

Removed public="false" on service sonata.block.templating.helper
add documentation support (travis and configuration)
fix Sphinx installationw
[documentation] improve Sphinx
[documentation] improve Sphinx support