mako.imports should not be flattened

mako.imports should be a list of strings, such as:

    from markupsafe import escape_silent \
    from other import something

Should be turned into:

    [
        'from markupsafe import escape_silent',
        'from other import something'
    ]

The previous incantation using aslist() would flatten those and would
turn it into something like:

    [
        'from',
        'markupsafe',
        ...
    ]

Closes #23
Update CHANGES
Merge branch 'fix.mako.imports'

Fix broken mako.imports config directive.
Release 1.0.2