adds /config/local_env.yml to .gitignore, going to put the api keys in there
* adds 'config/local_env_variables.rb' file to hold all the api keys
* adds code to 'config/environments/development.rb' to load the variables file into the local environment
* adds the variables file to the .gitignore

TODO: find all the other api keys! rdio and echonest, I think
adds echonest api key to the variables file and alters app/models/echonest.rb to use ENV variables
modifies app/models/seatgeek.rb to use ENV variable
going through, substituting ENV variables for hard-coded api keys
changed echonest_key variable to class variable
* removes the class variable from echonest.rb - code smell
* changes all the rdio consumer, token and user references in admin_controller.rb to use ENV variables instead
merge with current master
Merge pull request #52 from paopay/api_keys

Api keys