add index home_file as a IndexManager instance property
remove unneeded path join in request.index_data
remove code that will never get called
better performance for the load-requirements view
add missing space in flash message
basic concurrency support
concurrency for writing leaves
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
fix test to expect proper form of executor
new functional tests / gardening

 - webtest tests to get some better general coverage for whole app and
   configuration.

 - weak version of coverage for sync

 - a faux pipcache w/ a package
refactoring tweaks

 - template env as a registry member
 - partially apply move_on_error
configuration and improvements for sync

 - wait until proper files are available to avoid a race condition
 - configuration vars
test pip sync
ignore coverage
back merge index write flag