Add module bridgedb.safelog with automatic log filters.
Add module bridgedb.safelog with automatic log filters.

Include automatic filters for email addresses and IPv4/6
addresses. Things such as bridge fingerprints will still need to be
manually scrubbed by calling `bridgedb.safelog.logSafely()`.

mmaker/bridgedb,pagea/bridgedb,mmaker/bridgedb,pagea/bridgedb