Update extra.sh  Issue: #369 

As I mentioned in Issue: #369, during a first time install of logsearch the install failed to completed with the following error: 
```python: can't open file 'get-pip.py': [Errno 2] No such file or directory ```

When I tested the original link to get-pip.py I confirmed that there is a permanent redirect to the new location of this file.  I verified the ```>vagarant populate``` completes successfully when I replaced this url on my local machine.  

Outdated URL:  https://raw.github.com/pypa/pip/1.4.1/contrib/get-pip.py
New URL:  https://raw.githubusercontent.com/pypa/pip/1.4.1/contrib/get-pip.py