removed version numbers
added sortby to colleciton api
added sortBy to media selection
added changelog
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/sort-collections

Conflicts:
	CHANGELOG.md
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/sort-collections

Conflicts:
	CHANGELOG.md
fixed no default locale exists
added helper to generate alternate link tags
added helper function to generate seo meta tags
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/sort-collections

Conflicts:
	CHANGELOG.md
	src/Sulu/Bundle/MediaBundle/Resources/public/dist/components/media-selection/main.js
	src/Sulu/Bundle/MediaBundle/Resources/public/js/components/media-selection/main.js
fixed interfaces of colleciton manager
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/href-twig-helper
fixed code style
Ask confirmation before deleting referenced snippets
fixed testcase
fixed #532
fixed get languages for node
Merge pull request #538 from sulu-cmf/feature/href-twig-helper

Implemented meta twig helper
Merge pull request #511 from sulu-cmf/snippet-delete-reference

Snippet delete reference
bugfix #518 [content] Ordering of page changed when node is renamed