text: Title: Search
  Body: SearchView and Search urls should be implemented
  
  Better if using built in MongoDB full text search feature
  
  modules should have a way to define the index schema, maybe a new file **search_indexes.py** (remember to add in cookiecutter template)
  
  By default Content and Channel should be indexed.
  
  Search results should respect  "indexable" attribute in channels and avoid duplications.
  
  It should use for thumbnail the SubContent with "thumbnail" or "main_image" purpose (adding _thumb)
  