DATAMONGO-759 - Improved rendering of GroupOperation.

GroupOperation gets the _id field now rendered as null if no group fields were added to the operation. Previously it was rendered as empty document (i.e. { }). While this was technically correct as well, we're now closer to what the MongoDB reference documentation describes.

Original pull request: #73.
DATAMONGO-768 - Improve documentation of how to use @PersistenceConstructor.

Added an additional section to chapter 7.3 that describes the parameter value binding when the @PersistenceConstructor annotation including a small usage example. Added a concrete example for the @Value annotation that uses SpEL.

Original pull request: #77.
DATAMONGO-761 - Fix path key lookup for non-properties in SpringDataMongoDBSerializer.

In our Querydsl MongodbSerializer implementation we now only inspect the MongoPersistentProperty for a field name if the given path is really a property path. Previously we tried to always resolve a persistent property even if the given path was an array index path, a map key or the like.
DATAMONGO-771 - Fix raw JSON string handling in MongoTemplate.insert(…).

We now support insertion of JSON objects as plain strings via MongoTemplate.insert(…).

Original pull request: #79.
DATAMONGO-752 - Improved keyword detection in QueryMapper.

The check for keywords in QueryMapper now selectively decides between checks for a nested keyword (DBObject) object and the check for a simple key. This allows the usage of criteria values starting with $ (e.g. { 'myvalue' : '$334' }) without the value being considered a keyword and thus erroneously triggering a potential conversion of the value.

Moved more logic for a keyword into the Keyword value object.
DATAMONGO-769 - Improve support for arithmetic operators in AggregationFramework.

We now support the usage of field references in arithmetic projection operations.

Original pull request: #80.
DATAMONGO-746 - Creating an IndexInfo now also works with Doubles.

DefaultIndexOperations is now able to detect that in contrast to what's currently documented in the MongoDB reference documentation, it apparently returns double values for the index direction.

Original pull request: #67.
DATAMONGO-772 - Prepare 1.3.2.RELEASE.

Updated version of SD-CMNS to 1.6.2.RELEASE.
DATAMONGO-772 - Release version 1.3.2.RELEASE.
DATAMONGO-772 - Prepare next development iteration.