notary_http - Increase version for new feature work
pycache - create module to cache data using only RAM
pycache - add thread locks to a) prevent multiple threads from altering memory counts at the same time, and b) prevent multiple simultaneous sets of the same key
cache, notary_http - enable in-memory caching of observation data
unit tests - Add test cases for pycache
doc - Add document explaining advanced notary configuration