n sync

 - new pip_download_cache syncing options
 - new untested filesystem watcher
get sideways

 - use futures to optimize
 - extract methods to a pickeable class so we can use processes
 - add benchmarking
 - profit
gardening

 - ws
 - added an optional view for /index
benchmarking cm based on Dabeaz's
config for new stuff

 - configure futures executor (threads, proc, how many workers)
 - turn on pip dc sync
 - turn on auto sync