Merge branch 'feature-graphite' of https://github.com/matthieucan/adagios into matthieucan-feature-graphite
Added new setting: GRAPHITE_PREFIX

Useful in environments where graphite is not
dedicated to nagios/shinken. Gives the user the
ability to specify a prefix for all datapoints.
settings.GRAPHITE_ON -> settings.enable_graphite

This is more in sync with the naming convention inside settings.py
more specifically:

* stuff that is supposed to be configurable, is lowecase
* On/Off switches are prefixed with enable_*
* Made it off by default, since minority of users have graphite installed

I proposed a naming convention here:

https://github.com/opinkerfi/adagios/wiki/Developers-Guide#configurables-and-settingspy
settings.GRAPHITE_URL -> settings.graphite_url
settings.GRAPHITE_PREFIX -> graphite_prefix
Add graphite settings to adagios.conf
Add graphite options to /misc/settings
graphite.py - remove debug print statements
Unit tests for status.graphite

Just basic smoketests, nothing fancy
Merge branch 'matthieucan-feature-graphite' of github.com:opinkerfi/adagios
Merge branch 'master' of github.com:opinkerfi/adagios