Add helper function to define environment variables with defaults
Add helper function to parse environment variable urls into resources
Allow setting log output path via LOG_PATH environment variable
Allow specifying database configuration via DATABASE_URL env variable
Allow overriding caching engine with REDIS_URL env variables
Add extra configuration for buildpack
Add instructions for heroku use
Move environment helper methods to allow usage further up in the dispatch cycle
Allow configuration of Security salt and cipherSeed from environment variables