Fix issue with Vagrant and settings files.

[brittainhard]

Vagrant is still not properly copying the deploy settings file. Therefore, every time a nutch crawl is run there are failures. There needs to be a fix to this.

[brittainhard]

Current issue:

          ID: /vagrant/source/memex/settings.py
    Function: file.copy
      Result: True
     Comment: The target file "/vagrant/source/memex/settings.py" exists and will not be overwritten
     Started: 17:29:25.363369
    Duration: 6.775 ms
     Changes:  

[ahmadia]

This is a Salt, issue, not a Vagrant issue. You can either force over-writing the file yourself (Salt will not, by default, overwrite a file when it exists), or you can tell Salt to always overwrite the file. We need to have a more clear strategy for how we're using Salt in both deployment and development, but that's probably not a conversation to have in this specific issue, since issues should attempt to discuss one thing (whatever the title of the issue is).

[brittainhard]

Fixed in #573