change the scope of youtube and picasa to be http

this is required to get access tokens that will work over http. Old
access tokens with a https scope will not work so old accounts won't
be able to sync, but auth will work since self will be able to sync
with the new access tokens

however, http access tokens work over https so when we can change back
things won't be able to sync

we should still revert this asap so we have the most secure access
tokens
change gdata to make http requests and change affected urls to http
allow gdata.js to handle both http and https
only try to refresh the token one time so we don't loop

before this we would exhaust the rate limit trying to refresh a google
token if we weren't able to and we kept getting 403 and loop and
refresh again.

for this change it would happen during syncing with existing picasa
access tokens that are forbidden to be used over http
Merge pull request #861 from Singly/temp-gdata-http

Temp gdata http