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.
Changed the way css files are included

jQueryMobile requires to have the same imports in all the files. Only
ghome.less is now imported in the html files. It contains @import
directives to merge all the css/less files
Added the less compiler to node_modules. Compilation instructions are
included in ghome.less
Implemented sending a tram to a sensor. Especially, to the switch power plug. Writer.js is not usefule anymore, code moved to sensors_server.
Merging master into webserver branch + solving conflicts