Fixes problems in the server and package files of Express.
Adds some configuration files to Express and Slim.
Makes Express and Slim file system match more.
Adds a starter Flask application.
Completes the addition of Flask. Adds code to make the frameworks match better.
Removes .gitempty files that are no longer needed.
Merge branch 'master' of https://github.com/alanjames1987/How-to-Organize-Micro-Framework-Projects
Adds a starter Sinatra application.