UC personalization of Reddit

- our own favicon
- our own header
- script in all our neighborhoods' subreddits
- ...

Change-Id: I9f47683b7b056dd9569e3a2719da47879559dd41
Reviewed-on: https://code.urbancompass.com:8443/3073
Reviewed-by: Ugo Di Girolamo <ugo@urbancompass.com>
Tested-by: Ugo Di Girolamo <ugo@urbancompass.com>