Query should raise exceptions for non-ClauseElements passed

[Former user]

Query methods do not complain if boolean or other non-clause elements values are passed as positional arguments

for instance: MappedClass.query().filter_by( MappedClass.column_name=='foo' )

should raise an exception, letting the programmer know he forgot a .c

[Mike Bayer]

0.4 branch changeset:2745