Under some circumstances, the COPY TO streamming can be CPU-bound,
particularly when PG holds the resultset in memory buffers and the size
of the rows << chunk (64 KB in my linux box).
This commits improves the situation by creating a buffer of `chunk`
size and fitting in as many rows as it can before pushing them. This
results in more balanced read and writes (in terms of size and in bigger
chunks) as well as more frequent calls to the callback, thus freeing the
main loop for other events to be processed, and therefore avoiding
starvation.
* Eliminate detach/reattach strategy as it isn't able to differentiate between on/once and inconsistenly loses unshifted data depending on node version. Instead just split stream and send it to copy stream and the connection.stream at the same time. Disconnecting copy stream just means unpiping. Added handleCopyData to fulfill query contract but ignore the incoming data.
Add node 4.2.2 to Travis
Minimum postgres 9.2 to allow tests to complete in Travis
Remove test that is no longer needed since we no longer disconnect/reconnect listeners
* Add resume
* Remove node 0.10 and add 0.12
* Re-enable old tests
* Add more versions to the travis test matrix
