Fix microseconds logging, add decimal seconds.

Apache will log %D microseconds over 1 million for requests that take over a second, this change sync's that access log behavior since the formatting seems to be based on that. So a request that takes 1 second and 30 milliseconds will have 1000030 for this atom.

This pull request  also adds a %L atom for decimal seconds for a quick human-readable latency number. In the above example it would output 1.000030 to the log.
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Typo
Merge pull request #723 from zyegfryed/patch-1

Typo
Merge pull request #719 from bobzilladev/access-timing

Fix microseconds logging, add decimal seconds.
Respond to INFO signal with workers' age
Initial statsd instrumentation
Generate more statsd metrics
Submit metrics to stasd every 5s
Update README.rst
Update README.rst
Change travis image
Arbiter is on the same instrumentation schedule
Utilization is computed for the arbiter and for all workers
Documentation for new metrics
Ditch SIGINFO, undefined in linux
Remove mentions to SIGINFO since it is not supported on Linux
Add statsd configuration parameter

Not yet connected to anything.
Control instrumentation from the command line
Switch statsd on and off for workers too