initial commit
add packaging stuff
correct syntax
add Element as base class for Statement and Clause
remove gratuitous tests for type_ and file_ in Zone.__init__()
change string to str, integer to int in docstrings
correct docstring in Clause.__init__()
change test in _Conf.add_element() to account for Element base class
add comment attribute in iscconf
change Element to _Element
change from super() to explicit superclass methods
remove pprint import
move label writing to _Element.write()
handle newlines in comments
add comments about format in write() methods
tweak comments
tweak docstring
change type() to isinstance()
add comment kwarg to __init__() methods
add _Element.set_comment()