Common transformer tests (#97)

* Move chop lump transformer test to a generic log_note_transformer_test

* Add test cases to transformer test

- cat file flip
- cat file pit vow
- deal
- dent

* Move transformer tests over to transformer factor test file

- drip drip
- drip file ilk/repo/vow
- pit file deb ceiling/ilk/stability fee
- price feeds

* Move LogNoteTransformer test into factory package and remove log specific transformer tests

* Move Transformer test into factory package and remove log event specific transformer tests

* Respond to PR comments

pkg/transformers/test_data/mocks/repository.go

@@ -19,12 +19,14 @@ type MockRepository struct {
 	PassedHeaderID                   int64
 	PassedModels                     []interface{}
 	SetDbCalled                      bool
+	CreateCalledCounter              int
 }
 
 func (repository *MockRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedHeaderID = headerID
 	repository.PassedModels = models
 	repository.CreatedHeaderIds = append(repository.CreatedHeaderIds, headerID)
+	repository.CreateCalledCounter ++
 
 	return repository.createError
 }