Add debug symbols to binary
Add bust field to command line

Previously no new connections would be made once the program launched
the initial set of them.  Now a burst length field is set to say how
many requests per connection should be in flight at a time, but
connections complete as soon as <num requests> requests have been sent.
A new connection is then started in its place.  Essentially we now have
<num connections> in flight at any time, as well as <num requests> from
each connection in flight, with new requests AND new connections being
launched upon the completion of a previous one.
Write stats to stderr, not stdout
Fix whitespace error
Read in entire response (but ignore it)
Add connection rate code