fixed carbon setup.py missing maintenance plugins

https://github.com/graphite-project/carbon/issues/106
Aggregate only if the percentage of points with values is greater than the xFilesFactor.

adresses https://github.com/graphite-project/carbon/issues/52 

and partially https://github.com/graphite-project/ceres/issues/6
Merge pull request #115 from anomalizer/mc

Do not add values to the cache if it is full
mocker 1.1 is no longer in pip, but 1.1.1 is
Merge pull request #107 from anatolijd/megacarbon

ceres-maintenance rollup plugin fix