This makes the constructor consistent with other classes (e.g. Client, GridFS\Bucket) and also ensures that we don't have required parameters trailing optional arguments (i.e. options array).

This makes the operation consistent with the Collection method name and avoids the naming conflict with the ChangeStream iterator class.

PHPLIB-292: Apply type map to offsetGet and throw exceptions for mutate methods in TypeMapArrayIterator

The Operation classes were previously relying on MongoDB\Tests\Collection\FunctionalTestCase, so they required additional changes to initialize a Collection instance for asserting outcome of write operations.

This inserts an additional document so that we can assert that the first rewind and next calls do not block, while the last next does issue a getMore and block.

This removes the redundant "devel" matrix entry and refactors the config to inherit/override global environment vars.

This also bumps the ext-mongodb dependency to 1.4.0.

The MapReduce operation class will also need to call this for deciding which execute method to use in PHPLIB-316.