IM: Minor refinements (by @trons)

A few things were fixed here and there in the following modules:
- launcher.erl: added start_bencher/1 function,
- router.erl: added patterns to avoid errors in bencherl,
- server.erl: added patterns to avoid errors in bencherl,
- logger.erl: added launch/8 and launch_latency/5 functions, and
- toxic_client.erl: added launch/2 and launch_traffic/2 functions.
Server and logger mods for ERROR REPORTS
Add output Dir as an argument in logger functions
Re-wrap huge lines in logger
Add the coordinator for stopping