[persist] write to a temporary file first to give near atomic flushes
[persist] gzip compress snapshots

This gives us, e.g., 80% savings on the the persisted time series data.
[streamhist] starting to support arbitrary length streams
update readme
[streamhist] implementing a quantile() that doesn't use binary search
[web]trying roboto
[streamhist] extract out Histogram{} into its own file
[rinst] implement float stream
Merge branch 'master' of file:///Users/wiktor/Dropbox/obelisk
Merge branch 'agent' of file:///Users/wiktor/Dropbox/obelisk into agent
little updates
[rinst] fix float stream
get obelisk building again :/