Refactoring the webserver together with ndossougbe and selimabisaber. Now using requestHandlers to be able to use non-blocking action + removing now useless code. @TODO: Move requestHandlers in another file + add documentation on some of them
Added a default http request handler, refactored the sse related funtions
New sensors.sql file to create a database for sensors
Add dbms module
Add sql files to create tables (no values)
Modifications on sql files and add logs.sql
Modify scripts and add file containing sqlite commands
add file dataBaseInit.txt
Update sql/sensors_types.sql

I think 'light' will be easier to remember / type than 'luminosity' :) 
Update sql/condition_types.sql

Changed the storage type of "operator" column + added documentation
Update sql/logs.sql

Added foreign key to sensors table
Update sql/tasks.sql

Mandatory values have to be NOT NULL.
The "hour" in the day is actually not a "TIME" by itself.
The "Date" data type will store the year and we just want to be able to compare a day in the year (but, without problems of 365 vs 366-days-long years)
Update sql/conditions.sql

Mandatory fields => NOT NULL
Update sql/logs.sql

Mandatory fields => NOT NULL
Update sql/sensors.sql

Mandatory fields => NOT NULL
Implemented an example of ajax request

The server waits 2 sec before answering, it sends JSON
The client displays correctly the loading widget and then a dialog.