Document object mapping implications for Doctrine ORM
Merge pull request #316
Update README.md
Merge pull request #318 from RobertPlant/patch-1

Update README.md
Allow elastica 0.90. Elasticsearch made the jump from 0.20 to 0.90
Merge pull request #326 from Tobion/patch-1

Allow elastica 0.90. Elasticsearch made the jump from 0.20 to 0.90