added basic model for gazette
changed get_analizer to use lru_cache instead of parameter mambo jambo
added gazettes file generation to the preprocess
added gazette admin
added some basic gazette tests
added gazettes loader script
joining all entity ocurrences with same tokens from gazettes
added tests for found entities
cosmetic improvements on gazette admin
refactored freebase entries downloader so:
  - it works on py3
  - it returns the download entries instead of storing them on file
  - cleaned up some repeated code.
using new api of freebase downloader
new field on gazette items, and some admin improvements for them
removing uniqueness to field
adapting gazette loader script to work also on freebase downloading mode
error handling for freebase downloader
adding gazette relation with entity
changed way of storing the gazettes, added relation to the entity
fixed tests
fixed small bug on documents view
added option to delete entities from the interface