Issue title: Ripme downloads nothing even if the links it gets are ok
 Issue body: I used Ripme before and it worked well but i don't know why it isn't working now...
![unbenannt](https://cloud.githubusercontent.com/assets/20015062/16171713/67b93020-3576-11e6-9888-73bd157a8e28.png)
When I try to download anything, I get an error that it failed the DL but i don't know why because the image link is right there.
And When i try to copy and paste the link in my browser, I can see the Image (The "Only Image" link).
![unbenannt2](https://cloud.githubusercontent.com/assets/20015062/16171733/007ed6e8-3577-11e6-9b54-627f3573723e.png)
Anyone a clue?
![unbenannt3](https://cloud.githubusercontent.com/assets/20015062/16171737/26feaa46-3577-11e6-91b5-e1a44f20b992.png)
I tried 4 sites and I always got the same error...

 Comments: 
 Comment 0: I found the problem...
The Save Directory was set to a wrong location that doesn't exist...

{'source': 'GithubIssues', 'repo_name_with_owner': '4pr0n/ripme', 'issue_id': 161028734, 'repo_stars': 898.0}