Convert deprecated "timeout" option for Database::command()
Merge pull request #198
Merge branch '1.1.x'
Added ability to pass options to Collection::aggregate
Fixed expected options for mongo version < 1.5.0
Added aggregate cursor
Support by-reference server hash param for Database::command()

This is only supported in driver 1.5+. Since zend_parse_parameters() will complain if extra arguments are passed to extension methods, we need to count the arguments at runtime to only pass it when requested.
wip