fix find for not null fields
fix find for not null fields when sub object doesn't exist.
fix find for not null fields when sub object doesn't exist.
Merge pull request #42 from louisnerys/master

fix find for not null fields
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README: Fix XML typo.

Fix XML typo in logback's dependency example. Bad closing tag for <scope>.
Merge pull request #43 from smola/patch-1

README: Fix XML typo.
closes #44 : ObjectId and String are not the same
[maven-release-plugin] prepare release fongo-1.5.2
[maven-release-plugin] prepare for next development iteration
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