make pep8 pass on families folder with --max-line-length=100

Fixed 4 errors:
```
families/wikisourceorg_family.py:13:1: E302 expected 2 blank lines, found 1
families/wikisourceorg_family.py:23:5: E303 too many blank lines (3)
families/wmfwiki_family.py:13:1: E302 expected 2 blank lines, found 1
families/wmfwiki_family.py:23:5: E303 too many blank lines (3)
```