Added Configurable files for aggregation and rewrite rules
Updated example config to demonstrate new options

Conflicts:
	conf/carbon.conf.example
	lib/carbon/conf.py
Fixed really really broken attempt at cherrypicking
Missed a line in last stupidity reversion
Merge pull request #161 from drawks/master

Cherry picked 1928191 from 0.9.x into master - Adds configurable rewrite, relay, aggregation rule files