add collectd on bang

Ignore-this: cc86f69e0c31d4b08d597b302ed6ba56

darcs-hash:20141221005745-312f9-5af48dc50d6bbcc40e88401f395d59e6b6a2e101
use packaged version of graphite

Ignore-this: 9024210ee63a8b99566d11ef6dfbe25f

darcs-hash:20141221084306-312f9-c012091050c71e5131c873b3898ca532fbed8429
add perSecond function to graphite

Ignore-this: f13c7c069dc74c09c68c4c55b4023acb

darcs-hash:20141221091003-312f9-d6a242fab6102b229033c5126fe1333204db7132