* Added `Cassandra\Collection::remove()`.
* Added `Cassandra\Blob::toBinaryString()`.
* Added ability to configure io threads and connections per host.
* Enabled latency aware routing by default and added a way of disabling it.
* Enabled TCP nodelay, added a way of disabling it.
* Added configuration for TCP keepalive.
* [PHP-30] Segfault when using FutureRows
* [PHP-31] Segfault during deserialization of NULL values
* [PHP-33] Fixed timestamps generation on 32bit systems
* [PHP-37] Removed extra null byte when `Cassandra\Blob` created from string
* [PHP-41] Fix memory leak when using batch statements