added a weighted average function
missed keymap definition for new function
enable get all metrics in CLUSTER_SERVERS
Send requests to all carbonlink hosts when metric starts with CARBON_METRIC_PREFIX.

In a multi-carbon environment, the carbon stats are written by the carbon process that generates them and the consistent hash ring is ignored.  So, to gather the real-time stats we must ask all Carbon hosts for each carbon stat.
Add a function "sortByName"
Implementation of Dashboard Templates.

The initial work was done by Aleh Filipovich.  It has been modified to be more generic.
A suggested amendment to the documentation which makes installing the dependencies a lot quicker.
Initial tox.ini
Fix sphinx warnings
Specify python versions
Make travis use tox
Merge remote-tracking branch 'upstream/master' into feature/tox

Conflicts:
	.travis.yml
	webapp/graphite/render/functions.py
Add docs to travis builds
Try to leave prefix and remove it on travis
Fix django warnings about deprecated mimetype argument to HttpResponse
Add build status image
Add a docs section about dev/testing
Merge remote-tracking branch 'upstream/master' into feature/tox

Conflicts:
	docs/config-local-settings.rst
Fix docs warning
Manipulate setup.cfg's install section in setup.py