Pull request

1° Added the InsertBatchWithIdentity ( which uses oracle bulk options with OdpDataProvider and Batch insertion sql when using GenericDataProvider with UserQueryText = true). In oracle we reach 1500 insertions (with sequences) per sec.

2° Added the "ContainsExactly" string extension and its linq implementation in order to use the sql fonction "Contains"

3° FullMapping optimisation (Faster LazyLoading)

4° I've added a GenericDataProvider which permits to use any data provider installed on a machine without having a strong link to a specific dataprovider dll (it uses DbProviderFactories concept).

5° I've added a UseQueryText property on DataProvider Base which permits to generate plain text query instead of using command parameters (It's useful for Oracle when some "select queries" are way to fast in plain text).
N.B: The UseQueryText property moved to the DbManager level as I've got a lot of feedback from the persons who use this feature.

6° I've added an InsertWithIdentity method on SqlQuery object in order to mentain a similitude with the DbManager class.

7° Some bugs were fixed on JointureAddon which permit now more complex associations