Added structure cache warmer
fixed bug with order by not selected field
Merge pull request #294 from sulu-cmf/bugfix/list-sort

[BUGFIX] order by not selected field
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/sturcture-warmer

Conflicts:
	composer.json
Merge pull request #286 from sulu-cmf/feature/sturcture-warmer

Added structure cache warmer
resetted composer
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into develop

Conflicts:
	composer.json
Added structure cache warmer
Started refactoring for Snippets

- Make Structure a super type
- "Page" will take role of current Structure
- Snippet will be subclass of Structure
Introduced Page and added ContentMapperRequest object

- Introduced Page object as subtype of Structure.
- Added ContentMapperRequest and saveRequest method to content mapper
INtroducing Structure support
Added page and snippet mixins
Added Sulu Fixtures

- Loads data for webspace pages and snippets using the content mapper
Do not overwrite configured webspace path
Validate content mapper request
Throw better exception when no structure directory present
Added snippet support to loadByNode
Added TODO to content mapper test