Attach all eagerly loaded models in to-one

- The problem here is that due to the nature of the relationship and the
  way the loop was set up it was possible to miss some relationships:

A _ C
 \_ D

B _ E
 \_ F

Since we looped over A and B and did a break when we found something to
attach it to (in this example A would find C) it would break. What we
should be looping through is CDEF and finding a home for each one.

Did the same change in to_one though it doesn't matter since it's
one-to-one.

to-many is untouched because it's already looping over CDEF and finding
a home for it because the relationship is reversed.

- Fix #98

templates/07_relationship_to_one_eager.tpl

@@ -65,13 +65,17 @@ func ({{$varNameSingular}}L) Load{{$txt.Function.Name}}(e boil.Executor, singula
 	}
 	{{- end}}
 
-	if singular && len(resultSlice) != 0 {
+	if len(resultSlice) == 0 {
+		return nil
+	}
+
+	if singular {
 		object.R.{{$txt.Function.Name}} = resultSlice[0]
 		return nil
 	}
 
-	for _, foreign := range resultSlice {
-		for _, local := range slice {
+	for _, local := range slice {
+		for _, foreign := range resultSlice {
 			{{if $txt.Function.UsesBytes -}}
 			if 0 == bytes.Compare(local.{{$txt.Function.LocalAssignment}}, foreign.{{$txt.Function.ForeignAssignment}}) {
 			{{else -}}

templates/08_relationship_one_to_one_eager.tpl

@@ -65,13 +65,17 @@ func ({{$varNameSingular}}L) Load{{$txt.Function.Name}}(e boil.Executor, singula
 	}
 	{{- end}}
 
-	if singular && len(resultSlice) != 0 {
+	if len(resultSlice) == 0 {
+		return nil
+	}
+
+	if singular {
 		object.R.{{$txt.Function.Name}} = resultSlice[0]
 		return nil
 	}
 
-	for _, foreign := range resultSlice {
-		for _, local := range slice {
+	for _, local := range slice {
+		for _, foreign := range resultSlice {
 			{{if $txt.Function.UsesBytes -}}
 			if 0 == bytes.Compare(local.{{$txt.Function.LocalAssignment}}, foreign.{{$txt.Function.ForeignAssignment}}) {
 			{{else -}}