Latest pip version inconsistent - does not implement metrics_base_path

[tullis]

I have installed graphios from pip.
Thanks for your work on this tool, I think it's great.

I have been trying to implement a system which uses use_service_desc = True so it sends all of my metrics to graphite.

I have also decided to use a base path for all of my metrics, so I added metric_base_path = icinga to my config file. There was no commented template for this variable in my config file, so I had to add it.

The resulting whisper files are generated without this base path, so I started investigating why.

From my investigation it looks like the latest pip version is inconsistent and only includes some of the changes within this commit. Specifically these changes to graphios_backends.py don't seem to have been included.

2d6c078#diff-52a97f5de4dbf7f87c08baf311d76346L54

In addition to this, the change to graphios.cfg hasn't been included which explains not only why I had to add the configuration statement, but also it explains issue #95 as well.
2d6c078#diff-4df930f201411566ca416b64952a6420R52

I'm not going to make a pull request for it because I'm short of time, but hopefully this will help you to get the pip version up to date.

Once again, many thanks for this tool.