Changes
** Bug
* [PHP-706] - Busy loop when a file descriptors exceed 1024
* [PHP-850] - Conditional jump on empty server name to MongoClient
* [PHP-853] - MongoCollection::batchInsert() exceptions can obscure BSON encoding exceptions
* [PHP-858] - Crash when extending Mongo and MongoClient classes and not calling its constructor
* [PHP-872] - Driver should prevent \0 characters in keys, collection and database names