Fix: memory leaks in objects derived from EvWatcher
Refact: some frequent checks optimized
* New functional API supporting libfann version 2.1 and 2.2.
* More than 140 new functions.
* Many new algorithms and options for neural networks.
* Incompatible with previous version (rewritten from scratch).
- PHP 5.4 compatibility
- Sample PHP class for using zookeeper
- Fix NOTCONNECTED_STATE issue
- Various other fixes