Fix Oracle provider thread safety issue, fix LoadReferencesJoinTest on Oracle.
Merge pull request #401 from BruceCowan-AI/FixThreadSafetyAndLoadReferencesTest

Fix Oracle provider thread safety issue, fix LoadReferencesJoinTest on O...
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Add support for Master.RefTableId convention for 1:1 table references
Remove duplicate execution of Insert/Update filters in db.Save()
Add better API's for executing SP's with OUT params
Add LeftJoin test