Embedded fields should be ignored by default

[kobi-c0]

When adding an embedded fields like so:

type ColumnFields struct {
	ColA                              string    `db:"col_a" json:"col_a"`
	ColB                              string    `db:"col_b" json:"col_b"`
}

type TestStruct struct {
	ColumnFields 
}

We need to add the following tags to TestStruct in order for the encoding/decoding to work properly:
goqux:"skip_select,skip_insert"

Need to fix so that it would ignore such cases by default