Added installation process

When the index.php script is executed, it determines whether the
blogkit.ini file exists or not and creates it accordingly. It then asks
for a username-password combination to generate the HTPASSWD
file. In the next step it asks for the MySQL database connection
parameters and generates the default tables, granted that the given user
has enough rights to do it.
Finally, it generates the HTACCESS file that forbids access to protected
scripts.

From now on, when creating or editing a post a backup file is stored.
Merge branch 'master' of https://github.com/fedeetz/Blogkit