added initial version of Atomic Line List service [WIP]

This will fix issue #290. Support for more parameters is missing but will come soon.

Edit: The docstring for the method ``query_object`` needs to be fixed as well.
They do, but in Python 3, ``itertools.izip`` and ``itertools.imap`` have been renamed to the builtins ``zip`` and ``map``, respectively. That's why ``itertools.imap`` and ``itertools.izip`` don't exist anymore in Python 3.