Support for SQL INSERT INTO and SELECT ... INSERT - moving data between databases without bringing it into RAM.
-Contributed by Agile Design LLC ( http://agiledesignllc.com/ )

Signed-off-by: grandua
SelectInsert extension method for IDbSet.
Changed IDbCommand to IDbConnection as more universally available in extension methods that were based on IDbCommand.
InsertInto extension method on IDbSet
Used IQueryable<T> instead of IDbSet<T> for consistency.
Moved extension methods only working with DbContext/Object context into ObjectQueryExtensions for consistency.
Merge pull request #1 from grandua/master

Merger 	grandua