Fix #55

- Previously each call to qm.Load would overwrite your eager loading
  statement. I think this was deliberate at one point but it's pretty
  inconsistent. If we need to overwrite we can call queries.SetLoad()

queries/qm/query_mods.go

@@ -26,7 +26,7 @@ func SQL(sql string, args ...interface{}) QueryMod {
 // singular, you need to specify the singular form and vice versa.
 func Load(relationships ...string) QueryMod {
 	return func(q *queries.Query) {
-		queries.SetLoad(q, relationships...)
+		queries.AppendLoad(q, relationships...)
 	}
 }
 

queries/query.go

@@ -175,6 +175,11 @@ func SetLoad(q *Query, relationships ...string) {
 	q.load = append([]string(nil), relationships...)
 }
 
+// AppendLoad on the query.
+func AppendLoad(q *Query, relationships ...string) {
+	q.load = append(q.load, relationships...)
+}
+
 // SetSelect on the query.
 func SetSelect(q *Query, sel []string) {
 	q.selectCols = sel