add tags to gitignore
fix API, API docs

stream object in API had not been added
api: add author properly to playlist
core: initialize redis
one more ignored file. thanks automake
fix broken tools dependencies

core now needs hiredis
hits: redis backend
stat: push into redis
document: arbitrary content
stat/stat.h instead of restrictive push.h
stat: get data from redis
ytmgr: cli interface (no more sockets)
drop unused services
drop hitsd components: multiplex, clint
drop udpstat