Improve logo res.
Added gravatar default

Unsure whether url encoded at source or whether this will work.
We’ll see.
Merge pull request #121 from findsorguk/gravtars

Added gravatar default
Added url encode - will this work?
Merge pull request #122 from findsorguk/gravtars

Added url encode - will this work?
Urlencoded url
Merge pull request #123 from findsorguk/gravtars

Urlencoded url
Merge pull request #120 from ahb108/logoAB

Improve logo res.