added some comment for interface methods
add pipeline to stream for connecting a stream with a process to produce another stream; rename processor to process
change to use pipe to connect a stream to a process
rename stream interface argument block to output
add simple response time parser
fix request timestamp parser name
support custom format when parsing request timestamp
update littles law analysis to expect a parsed request timestamp
add slice_stream, simplify littles law analysis
update example of using littles law analysis