Make insert work with slices.

The Insert helper previously only worked if you specified each item by
hand. By not splitting out the arguments the way we did, it now supports
slice expansion.

query.go

@@ -63,18 +63,15 @@ func New(query string) *Query {
 // Insert returns a Query instance containing SQL that will insert the passed `values` into
 // the database. All `values` will be inserted into the same table, so invalid SQL will be
 // generated if all `values` are not the same type.
-func Insert(obj SQLTableNamer, values ...SQLTableNamer) *Query {
-	inserts := make([]SQLTableNamer, 0, len(values)+1)
-	inserts = append(inserts, obj)
-	inserts = append(inserts, values...)
-	columns := Columns(obj)
-	query := New("INSERT INTO " + Table(obj) + " (" + columns.String() + ") VALUES")
+func Insert(values ...SQLTableNamer) *Query {
+	columns := Columns(values[0])
+	query := New("INSERT INTO " + Table(values[0]) + " (" + columns.String() + ") VALUES")
 
-	for _, v := range inserts {
+	for _, v := range values {
 		columnValues := ColumnValues(v)
 		query.Expression("("+Placeholders(len(columnValues))+")", columnValues...)
 	}
-	return query.Flush(" ")
+	return query.Flush(", ")
 }
 
 // ErrWrongNumberArgs is returned when you’ve generated a Query with a certain number of