Fix metrics reporting.
Add per-process HTTP metrics.
Updated imagetype version (fix #29).
Changed mozjpeg module and install nasm in travis.

Replaced mozjpeg with mozjpeg-bin.
Now uses mozjpeg 2.0 and do the compilation during install instead of first run.
Correctly return from cache.handleRequest() when we don't have a GET
Add file logging, clean up logging usage
Allow a 'clobber' config option for the file logger

This makes us remove it on startup instead of appending
Move all testing config into config/test/test.yml

Also update logging config for tests. The console backend is
disabled, but there is a test.log file at debug level.
still at error level for tests, but the
Don't set the log level for tests at runtime

It's already set appropriately via the test config