Initial code drop
Rename couch_stats_stats_collector to couch_stats_aggregator
Bump folsom dependency
Handle the proper existing metric error atom
Simplify stat reloading functionality
Don't hoist application names in to stat reload logic
Use loaded_applications/0 instead of which_applications/0

This prevents app boot order from determining which metrics are
loaded and which aren't. We'd get them in the end anyway, but the
reload interval is intentionally slow.
Log unknown messages instead of crashing
Simplify couch_stats_aggregator:reload_metrics/0

h/t davisp
Store tracked processes in ets rather than dict
Make couch_stats_process_collector ets table public
Add license headers to source files
Use Cloudant's fork temporarily.

Our "fork" is just a mirror that's got a newer tag. This is because meck
has apparently removed its 0.8.1 tag which breaks rebar.