20140923 install com_helloworld part04

Adding a model to the site part
20140923 install com_helloworld part05

Adding a variable request in the menu type
20140923 install com_helloworld part06

Using the database
20140923 install com_helloworld part07

Basic backend
20140923 install com_helloworld part08

Adding language management
20140923 install com_helloworld part09

Adding backend actions
20140923 install com_helloworld part10

Adding decorations to the backend
20140923 install com_helloworld part11

Adding verifications
20140923 install com_helloworld part12

Adding categories
20140923 install com_helloworld part13

Adding configuration
20140923 install com_helloworld part14

Adding ACL
20140923 install com_helloworld part15

Adding an install uninstall update script file