Merge branch 'refs/heads/cms-search'

* refs/heads/cms-search:
  Implement page indexing
  Add content extractor
  Move storeId to group of ID fields
  Add schema field pageId
  Create basic page document
  Update rebuildIndex() method signature to allow different ways to call it
  Register CMS page indexer
  Remove explicit commit as Solr will do a soft-commit already
  Use internal _getResource() method
  Add a helper method to generate document IDs for page documents
  Make the CMS page model fire save and delete events
  Add skeleton for CMS indexer