[ELASTIC SEARCH] Add elastic search selector handler
Merge branch 'master' of git://github.com/rjanot/yucca

* 'master' of git://github.com/rjanot/yucca:
  [ENTITY TEXT FORM FIELD] fix transformer
  [YUCCA FORM ENTITY] Parameterized form entty parent : can now have a select, dynamically feeded for example