Don’t wait for empty buffers. If called with no operations queued, libcouchbase_wait() will block forever. This means that a single threaded application that calls libcouchbase_wait() at different times to make sure operations are sent to the server runs the risk of stalling indefinitely. This is a very likely scenario.

Issues: CCBC-59

Don’t define size_t and ssize_t for VS2008

Fix segfault while authorizing on protected buckets (211bb04)