Merge pull request #400 from miiihi/master

Fix SqlServer Missing whitespace before ORDER BY
remove unnecessary VistaDB config section
Fix OrderBy with tests
Update SS dlls
Match JOIN mapping with AutoQuery mapping behavior + add tests for different mappings
fix failing test
Add support for inverting sort direction of orderBy with '=' prefix e.g. orderBy=Id,-Name
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...
Update signed projs
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
Fix Can_OrderBy_Fields_with_different_sort_directions test on Oracle.
Merge pull request #402 from BruceCowan-AI/FixSqlExpressionTests

Fix Can_OrderBy_Fields_with_different_sort_directions test on Oracle.
Add Cast to UntypedApi
Add support for batch loading of references in multi select queries.

Only adds 1 additional query per reference.
Update docs to use LoadSelect
Fix threading issue in ModelDefinition