fix KeyError at localwiki-manage setup

I get KeyError when I run localwiki-manage setup_all.
```shell
(env)taro@test:/srv/deploy/lw006$ localwiki-manage setup_all
...
Get a Cloudmade API Key.
1. Go to http://cloudmade.com/register
2. After you've signed in, click "Get an API Key". Fill out the form (details don't matter)
3. Paste the API key below:
Traceback (most recent call last):
  File "/srv/deploy/lw006/env/bin/localwiki-manage", line 9, in <module>
    load_entry_point('localwiki==0.5.4', 'console_scripts', 'localwiki-manage')()
  File "/srv/deploy/lw006/env/local/lib/python2.7/site-packages/localwiki-0.5.4-py2.7.egg/sapling/manage.py", line 45, in main
    **init_options)
  File "/srv/deploy/lw006/env/local/lib/python2.7/site-packages/localwiki-0.5.4-py2.7.egg/sapling/utils/management/commands/init_settings.py", line 60, in run
    c.handle(**options)
  File "/srv/deploy/lw006/env/local/lib/python2.7/site-packages/localwiki-0.5.4-py2.7.egg/sapling/utils/management/commands/init_settings.py", line 45, in handle
    if not options['skip_cloudmade_key']:
KeyError: 'skip_cloudmade_key'
```
I fix it.