PR fixes; remove all infura token references and setup travis to use encrypted env

variable; rest of the ethjson_rpc dependent tests extracted to integration_test

libraries/shared/factories/event/README.md

@@ -264,7 +264,7 @@ func (repository *ExampleRepository) SetDB(db *postgres.DB) {
 }
 
 func (repository ExampleRepository) Create(headerID int64, models []interface{}) error {
-	tx, dBaseErr := repository.db.Begin()
+	tx, dBaseErr := repository.db.Beginx()
 	if dBaseErr != nil {
 		return dBaseErr
 	}

libraries/shared/watcher/contract_watcher.go

@@ -49,7 +49,6 @@ func (watcher *ContractWatcher) AddTransformers(inits interface{}) error {
 		return fmt.Errorf("initializers of type %T, not %T", inits, []transformer.ContractTransformerInitializer{})
 	}
 
-	watcher.Transformers = make([]transformer.ContractTransformer, 0, len(initializers))
 	for _, initializer := range initializers {
 		t := initializer(watcher.DB, watcher.BlockChain)
 		watcher.Transformers = append(watcher.Transformers, t)
@@ -65,7 +64,7 @@ func (watcher *ContractWatcher) AddTransformers(inits interface{}) error {
 	return nil
 }
 
-func (watcher *ContractWatcher) Execute(interface{}) error {
+func (watcher *ContractWatcher) Execute() error {
 	for _, transformer := range watcher.Transformers {
 		err := transformer.Execute()
 		if err != nil {