Error Handling

[heyhuyen]

If an error occurs on a user action, make that known to the user.

Potential errors to handle:

• Failed to fetch trips for user/following timelines
• Failed to fetch story places and media for trip
• Failed to add/edit/delete trip/storyplace/media/etc
• Places API requests

[heyhuyen]

• extend the placeholder in base activity to show either an image.
• no internet snackbar