<commit_before>A dict aliaser takes a dictionary as base for aliasing
::
    >>> from zodict.aliaser import DictAliaser
    >>> da = DictAliaser(alias1='key1', alias2='key2')

    >>> da.alias('key1')
    'alias1'

    >>> da.unalias('alias2')
    'key2'

    >>> da.alias('foo')
    Traceback (most recent call last):
    ...
    KeyError: 'foo'<commit_msg>fix test<commit_after>A dict aliaser takes a dictionary as base for aliasing
::
    >>> from zodict.aliaser import DictAliaser
    >>> da = DictAliaser([('alias1', 'key1'), ('alias2', 'key2')])

    >>> da.alias('key1')
    'alias1'

    >>> da.unalias('alias2')
    'key2'

    >>> da.alias('foo')
    Traceback (most recent call last):
    ...
    KeyError: 'foo'
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