Critical release : Search engines prototypes developped and tested for
API. 

1 : Regex search engine on sepecific fields (/api/find/[])
2 : Full text search based on MongoDB text indexation (/api/text/[]) 
3 : Approximative search based on external Elastic search engine
indexation. (/api/search/[])

/!\ important : MongoLabDAO does'nt implement yet these new
fonctionnalities. Text indexation has to be activated online, and a
distant elastic search engine has to connect to this MongoDB Cloud
instance. To be continued.

/!\ important : All indexes generated by the elastic search engine have
been ignored for this commit.