- append plugins.config_root to config_root only if plugins.config_root
  doens't start with a '/' or '~'
- assign merged dicts to active config.
Define all handlers in base logging config. Reassign FileHandlers'
filenames and streams once they have been determined.
prepend config_root for relative file names
fix --boto-debug code path
* setup module-level loggers for aminator and boto.
* fill in context.web_log at runtime
* move web_log_url_template to logging handler config.
Merge pull request #65 from Netflix/mtripoli-config_and_logging-fixes

Mtripoli config and logging fixes