Report submission form

When a Pokéstop marker is clicked and no field research task report has been filed for that Pokéstop a task report form should appear.

The form should:
- Say "Begin typing..."
- Auto-complete from user-input filtered drop down menu with items from task API
- Allow user to select reward from list of rewards defined in task
- Submit task to task API

Datamodel for post should look like:
```
{
"pokestopId": "id_of_pokestop",
"task": "Win a gym battle",
"reward": {
"item": { "name": "Potion", "amount": 3 }, //If the user picks an item reward
"encounter": ["Mankey", "Makuhita"] //If the user picks an encounter reward
}
}
```