yatck: Remove OAuth#syncRequest
yatck: Fix "Could not authenticate you" error in status/update

"Could not authenticate you" appears when an user tries to post a
message that contains special characters not escaped by
encodeURIComponent. Those characters include '(', ')', '"', and so
forth.
yatck: Display error messages returned by Twitter in status/update
yatck: Retrieve friends cache calmly
yatck: Version 3.1.9