Turn debug mode off by default.

Added a configuration class that can load different settings
for different environments. Run in debug mode with
PUPPETANALYTICS_DEBUG=true python puppetanalytics/app.py
Higher level - I dont think the app should automagically pick the correct config file. The operator should specify a config and we should respect their decision. Why not just ship a production config and devleopment config, and let the user specify?