Use new string builder for fetch() requests
Merge pull request #442 from jfsso/master

Use new string builder for fetch() requests
Enforce main thread for api calls.
Revert "Enforce main thread for api calls."

This reverts commit 2e5625dbd88d312b6a642120defaf9cf2e8ec313.
Enforce main thread for api calls.
Merge pull request #443 from square/dimitris/enforce

Enforce main thread for api calls.
Fix notifications for GB.
Merge pull request #452 from square/dimitris/notif-fix

Fix notifications for GB.
Merge commit '8376c599ee624dc152297ca5a73a4e2cac8fb113'