Replaced old readme with the new one
No need in queue-starter now

srw's start-multiple-task takes and remembers per-host id now,
there is no configure event and its no longer necessary to
extract number of queue workers from an exec profile.
So necessity in separate configuration tool has gone.
ack-multi takes just entry ids now instead of full data_array

Serialize|deserialize methods moved out of the data_array.
Its better to have them as template functions.
Version bump to 0.6.21
Brought non-libev timeouts to a working state