stackexchange-favs-to-pinboard

Since have to (well should do, to be nice) rate limit quite a lot it can
be slow to add new bookmarks to Pinboard when we are checking Pinboard
for every single StackExchange fav. Keep a local cache of items already
added to Pinboard.

Some things I have to do (note to self):

- Check for success on Pinboard add before adding to cache
- Consider removing bookmarks on Pinboard for unfaved StackExchange
items? Leaf check-in: 29383c0dea user: base@atomicules.co.uk tags: origin/master, trunk

- As a result of previous commit, discovered that Ruby open-uri now
seems to automatically decompress Gzip data so parsing of responses is
more simple now.
- Also, update the API version
- Use response.read instead of string as some responses are too long for
string and get written to a tempfile
- Ensure we are making no more than 30 requests/sec check-in: cb04e6d1bf user: base@atomicules.co.uk tags: origin/master, trunk