Fixed infinite loop in JSONCollection.save
Fixed JSONCollection.save when the document does not exist and _id is defined
JSONQueryBuilder must only write defined query options (sort, comment, …)

Fix mongodb error "bad hint (code = 10113)" with null hint
Merge pull request #25 from FabienPennequin/fix_jsoncollection_save

Fix for save method in JSONCollection
Adding BSONSymbol converter

Introducing a $symbol notation to handle the conversion between BSON and
JSON.
Merge pull request #26 from ethul/feature-bson-symbols

Adding BSONSymbol converter
Revert "Bug fix, to use new gridfs"

This reverts commit 05a8e2cc88434ae912c9e5250fa37a6ac232dee8.
Merge commit '9dff48ab4e9a9c1be04a20181832b6de218091e1'
real bug fix, also test with reactivemongo-demo-app