Added a configuration file to the app and used its values in the Server class.
Now the webserver returns the fields requested in the call.
Pagination parameters now used in the database query.
All parameters in the request working well except filters.
Added forgotten config file from a previous commit.
Now the fields parameters is accepted as an array.
Improved sanitize of parameters by limiting the range of parameters accepted and their values.
Also allowed the parameter 'type' that allows one to filter the results
Code cleaning and results=all shows every result
Renamed 'is_published' to 'tweeted' in the database table and allowed tweeted as a filter in the webservice.
Implemented the put method to update the tweeted status for a particular event.
Show message when no events found.