Add configuration file, stores API keys

How to use:
  Copy config.cfg.template as config.cfg
  Request Flickr API Key:
      http://www.flickr.com/services/apps/create/noncommercial/?
  Enter API Key in config.cfg

config.cfg is on .gitignore, so your key is safe ;)
Create directory data/metadata
Fix config file: use ';' for in-line comments
Add crawler.py, can parse meta file into map