bin: add link_flair.py for interacting with link flair on submissions
bin: add link_flair.py for interacting with link flair on submissions

To get currently assigned link flair:
```
$ python link_flair.py get 5ok5r9
Flair text: Blue Post
Flair class: bluepost
```

To set link flair:
```
$ python link_flair.py set 5ok5r9 --text "Blue Post" --class "bluepost"
Link flair set
```

rhots/automation