Refactor delete handlers

Fixes #18.

errors/characteristics.go

@@ -7,4 +7,6 @@ var (
 	ErrCharacteristicNotFound = errors.New("Characteristic not found")
 	// ErrCharacteristicNotUpdated when not updated.
 	ErrCharacteristicNotUpdated = errors.New("Characteristic not updated")
+	// ErrCharacteristicNotDeleted when not deleted.
+	ErrCharacteristicNotDeleted = errors.New("Characteristic not deleted")
 )

errors/measurements.go

@@ -5,6 +5,8 @@ import "errors"
 var (
 	// ErrMeasurementNotFound when not found.
 	ErrMeasurementNotFound = errors.New("Measurement not found")
-	// ErrMeasurementNotUpdate when not updated.
+	// ErrMeasurementNotUpdated when not updated.
 	ErrMeasurementNotUpdated = errors.New("Measurement not updated")
+	// ErrMeasurementNotDeleted when not deleted.
+	ErrMeasurementNotDeleted = errors.New("Measurement not deleted")
 )

errors/species.go

@@ -7,4 +7,6 @@ var (
 	ErrSpeciesNotFound = errors.New("Species not found")
 	// ErrSpeciesNotUpdated when not updated.
 	ErrSpeciesNotUpdated = errors.New("Species not updated")
+	// ErrSpeciesNotDeleted when not deleted.
+	ErrSpeciesNotDeleted = errors.New("Species not deleted")
 )

errors/strains.go

@@ -7,4 +7,6 @@ var (
 	ErrStrainNotFound = errors.New("Strain not found")
 	// ErrStrainNotUpdated when not updated.
 	ErrStrainNotUpdated = errors.New("Strain not updated")
+	// ErrStrainNotDeleted when not deleted.
+	ErrStrainNotDeleted = errors.New("Strain not deleted")
 )

errors/users.go

@@ -6,7 +6,9 @@ var (
 	// ErrUserNotFound when not found.
 	ErrUserNotFound = errors.New("No user found")
 	// ErrUserNotUpdated when not updated.
-	ErrUserNotUpdated = errors.New("Count 0")
+	ErrUserNotUpdated = errors.New("User not updated")
+	// ErrUserNotDeleted when not deleted.
+	ErrUserNotDeleted = errors.New("User not deleted")
 	// ErrUserMissingEmail when missing email.
 	ErrUserMissingEmail = errors.New("Missing email")
 	// ErrInvalidEmailOrPassword when invalid login credentials.