Make sure we have something to free
Fix memory leak when splitting a ns
Tell PHP this is indeed an exposed stream that it doesn't have to worry about
Do not test the error messages from the server

The error message vary depending on the server version
Fixed PHP-1232: Implement the TODO
Avoid compiler warnings
PHP-1183: Implement default Iterator class for QueryResult & CommandResult
Fixed PHP-1185: Implement Cursor class
PHP-1185: Add more Cursor related methods
PHP-1190: Implement BSON\UTCDateTime
Fixed PHP-1174: Implement WriteBatch::count()
Bump libmongoc, and temporary switch to my fork with the needed patches