Snippet support

- Introducing support for writing snippets
fixed codestyle and interfaces
added type parameter
Merge branch 'develop' of git://github.com/sulu-cmf/SuluContentBundle into feature/snippets
fixed array bug
Merge branch 'develop' of git://github.com/sulu-cmf/SuluContentBundle into feature/snippets

Conflicts:
	Content/Structure/ExcerptStructureExtension.php
Updated default template DI param name
updated 'sulu.content.template.default' to 'sulu.content.structure.default_type.page'
Default to page type
fixed typo
Merge branch 'develop' of git://github.com/sulu-cmf/SuluContentBundle into feature/snippets
updated test cases
fixed internal links ids
fixed dsscendentnode
view optional webpacekey
added optional webspace for cget nodes
fixed testcase
Merge branch 'bugfix/remove-smart-content-filtered-query-build' into feature/snippets
Merge branch 'feature/cached-uröl' into feature/snippets
fixed testcases