added meta to xsd schema
added to class generation and tests
Throw exception when block type is not set

Rather than Fatal Error,

Fixes #174
Merge branch 'develop'
updated version numbers
Improved exception handling

- Improved exception handling (wrap original exception)
- And show the real problem when a template does not exist.
fixed in/external link handling
added in/extenal template
removed mandatory
fixed typo
added structure linked attribute
Merge branch 'feature/template-title-local' of git://github.com/sulu-cmf/sulu into hotfix/template-title

Conflicts:
	src/Sulu/Component/Content/Structure.php
renamed title to localized title
updated version numbers
fixed partial update
fixed block content type
fixed block content type
Merge pull request #201 from sulu-cmf/hotfix/in-external-link

[HOTFIX] Stabilize in and external links
Update composer.json
Merge pull request #203 from sulu-cmf/hotfix/in-external-link

Hotfix/in external link