Added support for BulkInsert and InsertFrom

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This update includes support for:

• BulkInsert of an IEnumerable<TEntity> into a single table
• InsertFrom to insert records into one table based on a select statement (SQL Server 'insert from' syntax)
• To support BulkInsert / InsertFrom, added support for multiple mapping fragments and constant property values
• Improved schema name detection
• Updated Microsoft's DynamicQuery code to include additional operations, including "IsType" (OfType), and "In", as well as a generic version of Select and additional options for OrderBy / OrderByDescending