Change copyright year to 2014.

Change copyright year to 2014.

This year, we're really on time. The changes in this patch were
created by the following silly script:

    files=$(git grep -l 'Copyright (C) [0-9]\{4\}\(-2013\)* Andre Noll')
    sed --in-place= -e 's/Copyright (C) \([0-9]\{4\}\)-2013 Andre Noll/Copyright (C) \1-2014 Andre Noll/1' $files
    sed --in-place= -e 's/Copyright (C) 2013 Andre Noll/Copyright (C) 2013-2014 Andre Noll/1' $files